675 lines
23 KiB
C
675 lines
23 KiB
C
/**
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* util.h - utility functions
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*
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* Copyright (c) 2016-present, Przemyslaw Skibinski, Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#ifndef UTIL_H_MODULE
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#define UTIL_H_MODULE
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#if defined (__cplusplus)
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extern "C" {
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#endif
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/*-****************************************
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* Dependencies
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******************************************/
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#include "platform.h" /* PLATFORM_POSIX_VERSION */
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#include <stdlib.h> /* malloc */
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#include <stddef.h> /* size_t, ptrdiff_t */
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#include <stdio.h> /* fprintf */
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#include <string.h> /* strncmp */
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#include <sys/types.h> /* stat, utime */
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#include <sys/stat.h> /* stat */
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#if defined(_MSC_VER)
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# include <sys/utime.h> /* utime */
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# include <io.h> /* _chmod */
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#else
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# include <unistd.h> /* chown, stat */
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# include <utime.h> /* utime */
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#endif
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#include <time.h> /* time */
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#include <errno.h>
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#include "mem.h" /* U32, U64 */
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/* ************************************************************
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* Avoid fseek()'s 2GiB barrier with MSVC, MacOS, *BSD, MinGW
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***************************************************************/
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#if defined(_MSC_VER) && (_MSC_VER >= 1400)
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# define UTIL_fseek _fseeki64
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#elif !defined(__64BIT__) && (PLATFORM_POSIX_VERSION >= 200112L) /* No point defining Large file for 64 bit */
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# define UTIL_fseek fseeko
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#elif defined(__MINGW32__) && defined(__MSVCRT__) && !defined(__STRICT_ANSI__) && !defined(__NO_MINGW_LFS)
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# define UTIL_fseek fseeko64
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#else
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# define UTIL_fseek fseek
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#endif
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/*-****************************************
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* Sleep functions: Windows - Posix - others
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******************************************/
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#if defined(_WIN32)
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# include <windows.h>
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# define SET_REALTIME_PRIORITY SetPriorityClass(GetCurrentProcess(), REALTIME_PRIORITY_CLASS)
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# define UTIL_sleep(s) Sleep(1000*s)
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# define UTIL_sleepMilli(milli) Sleep(milli)
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#elif PLATFORM_POSIX_VERSION >= 0 /* Unix-like operating system */
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# include <unistd.h>
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# include <sys/resource.h> /* setpriority */
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# include <time.h> /* clock_t, nanosleep, clock, CLOCKS_PER_SEC */
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# if defined(PRIO_PROCESS)
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# define SET_REALTIME_PRIORITY setpriority(PRIO_PROCESS, 0, -20)
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# else
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# define SET_REALTIME_PRIORITY /* disabled */
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# endif
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# define UTIL_sleep(s) sleep(s)
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# if (defined(__linux__) && (PLATFORM_POSIX_VERSION >= 199309L)) || (PLATFORM_POSIX_VERSION >= 200112L) /* nanosleep requires POSIX.1-2001 */
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# define UTIL_sleepMilli(milli) { struct timespec t; t.tv_sec=0; t.tv_nsec=milli*1000000ULL; nanosleep(&t, NULL); }
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# else
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# define UTIL_sleepMilli(milli) /* disabled */
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# endif
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#else
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# define SET_REALTIME_PRIORITY /* disabled */
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# define UTIL_sleep(s) /* disabled */
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# define UTIL_sleepMilli(milli) /* disabled */
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#endif
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/* *************************************
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* Constants
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***************************************/
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#define LIST_SIZE_INCREASE (8*1024)
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/*-****************************************
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* Compiler specifics
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******************************************/
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#if defined(__INTEL_COMPILER)
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# pragma warning(disable : 177) /* disable: message #177: function was declared but never referenced, useful with UTIL_STATIC */
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#endif
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#if defined(__GNUC__)
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# define UTIL_STATIC static __attribute__((unused))
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#elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
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# define UTIL_STATIC static inline
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#elif defined(_MSC_VER)
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# define UTIL_STATIC static __inline
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#else
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# define UTIL_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */
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#endif
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/*-****************************************
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* Time functions
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******************************************/
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#if defined(_WIN32) /* Windows */
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typedef LARGE_INTEGER UTIL_freq_t;
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typedef LARGE_INTEGER UTIL_time_t;
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UTIL_STATIC void UTIL_initTimer(UTIL_freq_t* ticksPerSecond) { if (!QueryPerformanceFrequency(ticksPerSecond)) fprintf(stderr, "ERROR: QueryPerformance not present\n"); }
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UTIL_STATIC void UTIL_getTime(UTIL_time_t* x) { QueryPerformanceCounter(x); }
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UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_freq_t ticksPerSecond, UTIL_time_t clockStart, UTIL_time_t clockEnd) { return 1000000ULL*(clockEnd.QuadPart - clockStart.QuadPart)/ticksPerSecond.QuadPart; }
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UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_freq_t ticksPerSecond, UTIL_time_t clockStart, UTIL_time_t clockEnd) { return 1000000000ULL*(clockEnd.QuadPart - clockStart.QuadPart)/ticksPerSecond.QuadPart; }
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#elif defined(__APPLE__) && defined(__MACH__)
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#include <mach/mach_time.h>
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typedef mach_timebase_info_data_t UTIL_freq_t;
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typedef U64 UTIL_time_t;
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UTIL_STATIC void UTIL_initTimer(UTIL_freq_t* rate) { mach_timebase_info(rate); }
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UTIL_STATIC void UTIL_getTime(UTIL_time_t* x) { *x = mach_absolute_time(); }
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UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_freq_t rate, UTIL_time_t clockStart, UTIL_time_t clockEnd) { return (((clockEnd - clockStart) * (U64)rate.numer) / ((U64)rate.denom))/1000ULL; }
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UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_freq_t rate, UTIL_time_t clockStart, UTIL_time_t clockEnd) { return ((clockEnd - clockStart) * (U64)rate.numer) / ((U64)rate.denom); }
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#elif (PLATFORM_POSIX_VERSION >= 200112L)
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#include <sys/times.h> /* times */
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typedef U64 UTIL_freq_t;
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typedef U64 UTIL_time_t;
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UTIL_STATIC void UTIL_initTimer(UTIL_freq_t* ticksPerSecond) { *ticksPerSecond=sysconf(_SC_CLK_TCK); }
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UTIL_STATIC void UTIL_getTime(UTIL_time_t* x) { struct tms junk; clock_t newTicks = (clock_t) times(&junk); (void)junk; *x = (UTIL_time_t)newTicks; }
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UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_freq_t ticksPerSecond, UTIL_time_t clockStart, UTIL_time_t clockEnd) { return 1000000ULL * (clockEnd - clockStart) / ticksPerSecond; }
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UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_freq_t ticksPerSecond, UTIL_time_t clockStart, UTIL_time_t clockEnd) { return 1000000000ULL * (clockEnd - clockStart) / ticksPerSecond; }
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#else /* relies on standard C (note : clock_t measurements can be wrong when using multi-threading) */
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typedef clock_t UTIL_freq_t;
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typedef clock_t UTIL_time_t;
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UTIL_STATIC void UTIL_initTimer(UTIL_freq_t* ticksPerSecond) { *ticksPerSecond=0; }
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UTIL_STATIC void UTIL_getTime(UTIL_time_t* x) { *x = clock(); }
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UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_freq_t ticksPerSecond, UTIL_time_t clockStart, UTIL_time_t clockEnd) { (void)ticksPerSecond; return 1000000ULL * (clockEnd - clockStart) / CLOCKS_PER_SEC; }
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UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_freq_t ticksPerSecond, UTIL_time_t clockStart, UTIL_time_t clockEnd) { (void)ticksPerSecond; return 1000000000ULL * (clockEnd - clockStart) / CLOCKS_PER_SEC; }
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#endif
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/* returns time span in microseconds */
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UTIL_STATIC U64 UTIL_clockSpanMicro( UTIL_time_t clockStart, UTIL_freq_t ticksPerSecond )
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{
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UTIL_time_t clockEnd;
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UTIL_getTime(&clockEnd);
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return UTIL_getSpanTimeMicro(ticksPerSecond, clockStart, clockEnd);
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}
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UTIL_STATIC void UTIL_waitForNextTick(UTIL_freq_t ticksPerSecond)
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{
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UTIL_time_t clockStart, clockEnd;
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UTIL_getTime(&clockStart);
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do {
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UTIL_getTime(&clockEnd);
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} while (UTIL_getSpanTimeNano(ticksPerSecond, clockStart, clockEnd) == 0);
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}
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/*-****************************************
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* File functions
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******************************************/
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#if defined(_MSC_VER)
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#define chmod _chmod
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typedef struct __stat64 stat_t;
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#else
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typedef struct stat stat_t;
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#endif
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UTIL_STATIC int UTIL_setFileStat(const char *filename, stat_t *statbuf)
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{
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int res = 0;
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struct utimbuf timebuf;
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timebuf.actime = time(NULL);
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timebuf.modtime = statbuf->st_mtime;
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res += utime(filename, &timebuf); /* set access and modification times */
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#if !defined(_WIN32)
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res += chown(filename, statbuf->st_uid, statbuf->st_gid); /* Copy ownership */
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#endif
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res += chmod(filename, statbuf->st_mode & 07777); /* Copy file permissions */
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errno = 0;
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return -res; /* number of errors is returned */
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}
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UTIL_STATIC int UTIL_getFileStat(const char* infilename, stat_t *statbuf)
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{
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int r;
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#if defined(_MSC_VER)
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r = _stat64(infilename, statbuf);
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if (r || !(statbuf->st_mode & S_IFREG)) return 0; /* No good... */
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#else
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r = stat(infilename, statbuf);
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if (r || !S_ISREG(statbuf->st_mode)) return 0; /* No good... */
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#endif
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return 1;
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}
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UTIL_STATIC int UTIL_isRegFile(const char* infilename)
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{
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stat_t statbuf;
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return UTIL_getFileStat(infilename, &statbuf); /* Only need to know whether it is a regular file */
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}
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UTIL_STATIC U32 UTIL_isDirectory(const char* infilename)
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{
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int r;
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stat_t statbuf;
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#if defined(_MSC_VER)
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r = _stat64(infilename, &statbuf);
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if (!r && (statbuf.st_mode & _S_IFDIR)) return 1;
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#else
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r = stat(infilename, &statbuf);
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if (!r && S_ISDIR(statbuf.st_mode)) return 1;
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#endif
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return 0;
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}
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UTIL_STATIC U32 UTIL_isLink(const char* infilename)
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{
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#if defined(_WIN32)
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/* no symlinks on windows */
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(void)infilename;
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#else
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int r;
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stat_t statbuf;
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r = lstat(infilename, &statbuf);
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if (!r && S_ISLNK(statbuf.st_mode)) return 1;
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#endif
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return 0;
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}
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UTIL_STATIC U64 UTIL_getFileSize(const char* infilename)
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{
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int r;
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#if defined(_MSC_VER)
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struct __stat64 statbuf;
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r = _stat64(infilename, &statbuf);
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if (r || !(statbuf.st_mode & S_IFREG)) return 0; /* No good... */
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#elif defined(__MINGW32__) && defined (__MSVCRT__)
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struct _stati64 statbuf;
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r = _stati64(infilename, &statbuf);
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if (r || !(statbuf.st_mode & S_IFREG)) return 0; /* No good... */
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#else
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struct stat statbuf;
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r = stat(infilename, &statbuf);
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if (r || !S_ISREG(statbuf.st_mode)) return 0; /* No good... */
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#endif
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return (U64)statbuf.st_size;
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}
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UTIL_STATIC U64 UTIL_getTotalFileSize(const char** fileNamesTable, unsigned nbFiles)
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{
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U64 total = 0;
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unsigned n;
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for (n=0; n<nbFiles; n++)
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total += UTIL_getFileSize(fileNamesTable[n]);
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return total;
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}
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/*
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* A modified version of realloc().
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* If UTIL_realloc() fails the original block is freed.
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*/
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UTIL_STATIC void *UTIL_realloc(void *ptr, size_t size)
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{
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void *newptr = realloc(ptr, size);
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if (newptr) return newptr;
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free(ptr);
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return NULL;
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}
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static int g_utilDisplayLevel;
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#define UTIL_DISPLAY(...) fprintf(stderr, __VA_ARGS__)
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#define UTIL_DISPLAYLEVEL(l, ...) { if (g_utilDisplayLevel>=l) { UTIL_DISPLAY(__VA_ARGS__); } }
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#ifdef _WIN32
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# define UTIL_HAS_CREATEFILELIST
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UTIL_STATIC int UTIL_prepareFileList(const char *dirName, char** bufStart, size_t* pos, char** bufEnd, int followLinks)
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{
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char* path;
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int dirLength, fnameLength, pathLength, nbFiles = 0;
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WIN32_FIND_DATAA cFile;
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HANDLE hFile;
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dirLength = (int)strlen(dirName);
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path = (char*) malloc(dirLength + 3);
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if (!path) return 0;
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memcpy(path, dirName, dirLength);
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path[dirLength] = '\\';
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path[dirLength+1] = '*';
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path[dirLength+2] = 0;
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hFile=FindFirstFileA(path, &cFile);
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if (hFile == INVALID_HANDLE_VALUE) {
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fprintf(stderr, "Cannot open directory '%s'\n", dirName);
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return 0;
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}
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free(path);
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do {
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fnameLength = (int)strlen(cFile.cFileName);
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path = (char*) malloc(dirLength + fnameLength + 2);
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if (!path) { FindClose(hFile); return 0; }
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memcpy(path, dirName, dirLength);
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path[dirLength] = '\\';
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memcpy(path+dirLength+1, cFile.cFileName, fnameLength);
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pathLength = dirLength+1+fnameLength;
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path[pathLength] = 0;
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if (cFile.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
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if (strcmp (cFile.cFileName, "..") == 0 ||
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strcmp (cFile.cFileName, ".") == 0) continue;
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nbFiles += UTIL_prepareFileList(path, bufStart, pos, bufEnd, followLinks); /* Recursively call "UTIL_prepareFileList" with the new path. */
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if (*bufStart == NULL) { free(path); FindClose(hFile); return 0; }
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}
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else if ((cFile.dwFileAttributes & FILE_ATTRIBUTE_NORMAL) || (cFile.dwFileAttributes & FILE_ATTRIBUTE_ARCHIVE) || (cFile.dwFileAttributes & FILE_ATTRIBUTE_COMPRESSED)) {
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if (*bufStart + *pos + pathLength >= *bufEnd) {
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ptrdiff_t newListSize = (*bufEnd - *bufStart) + LIST_SIZE_INCREASE;
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*bufStart = (char*)UTIL_realloc(*bufStart, newListSize);
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*bufEnd = *bufStart + newListSize;
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if (*bufStart == NULL) { free(path); FindClose(hFile); return 0; }
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}
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if (*bufStart + *pos + pathLength < *bufEnd) {
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strncpy(*bufStart + *pos, path, *bufEnd - (*bufStart + *pos));
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*pos += pathLength + 1;
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nbFiles++;
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}
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}
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free(path);
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} while (FindNextFileA(hFile, &cFile));
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FindClose(hFile);
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return nbFiles;
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}
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#elif defined(__linux__) || (PLATFORM_POSIX_VERSION >= 200112L) /* opendir, readdir require POSIX.1-2001 */
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# define UTIL_HAS_CREATEFILELIST
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# include <dirent.h> /* opendir, readdir */
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# include <string.h> /* strerror, memcpy */
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UTIL_STATIC int UTIL_prepareFileList(const char *dirName, char** bufStart, size_t* pos, char** bufEnd, int followLinks)
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{
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DIR *dir;
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struct dirent *entry;
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char* path;
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int dirLength, fnameLength, pathLength, nbFiles = 0;
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if (!(dir = opendir(dirName))) {
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fprintf(stderr, "Cannot open directory '%s': %s\n", dirName, strerror(errno));
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return 0;
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}
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dirLength = (int)strlen(dirName);
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errno = 0;
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while ((entry = readdir(dir)) != NULL) {
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if (strcmp (entry->d_name, "..") == 0 ||
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strcmp (entry->d_name, ".") == 0) continue;
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fnameLength = (int)strlen(entry->d_name);
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path = (char*) malloc(dirLength + fnameLength + 2);
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if (!path) { closedir(dir); return 0; }
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memcpy(path, dirName, dirLength);
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path[dirLength] = '/';
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memcpy(path+dirLength+1, entry->d_name, fnameLength);
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pathLength = dirLength+1+fnameLength;
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path[pathLength] = 0;
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if (!followLinks && UTIL_isLink(path)) {
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UTIL_DISPLAYLEVEL(2, "Warning : %s is a symbolic link, ignoring\n", path);
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continue;
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}
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if (UTIL_isDirectory(path)) {
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nbFiles += UTIL_prepareFileList(path, bufStart, pos, bufEnd, followLinks); /* Recursively call "UTIL_prepareFileList" with the new path. */
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if (*bufStart == NULL) { free(path); closedir(dir); return 0; }
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} else {
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if (*bufStart + *pos + pathLength >= *bufEnd) {
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ptrdiff_t newListSize = (*bufEnd - *bufStart) + LIST_SIZE_INCREASE;
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*bufStart = (char*)UTIL_realloc(*bufStart, newListSize);
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*bufEnd = *bufStart + newListSize;
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if (*bufStart == NULL) { free(path); closedir(dir); return 0; }
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}
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if (*bufStart + *pos + pathLength < *bufEnd) {
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strncpy(*bufStart + *pos, path, *bufEnd - (*bufStart + *pos));
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*pos += pathLength + 1;
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nbFiles++;
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}
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}
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free(path);
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errno = 0; /* clear errno after UTIL_isDirectory, UTIL_prepareFileList */
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}
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if (errno != 0) {
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fprintf(stderr, "readdir(%s) error: %s\n", dirName, strerror(errno));
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free(*bufStart);
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*bufStart = NULL;
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}
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closedir(dir);
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return nbFiles;
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}
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#else
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UTIL_STATIC int UTIL_prepareFileList(const char *dirName, char** bufStart, size_t* pos, char** bufEnd, int followLinks)
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{
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(void)bufStart; (void)bufEnd; (void)pos;
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fprintf(stderr, "Directory %s ignored (compiled without _WIN32 or _POSIX_C_SOURCE)\n", dirName);
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return 0;
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}
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#endif /* #ifdef _WIN32 */
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/*
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* UTIL_createFileList - takes a list of files and directories (params: inputNames, inputNamesNb), scans directories,
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* and returns a new list of files (params: return value, allocatedBuffer, allocatedNamesNb).
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|
* After finishing usage of the list the structures should be freed with UTIL_freeFileList(params: return value, allocatedBuffer)
|
|
* In case of error UTIL_createFileList returns NULL and UTIL_freeFileList should not be called.
|
|
*/
|
|
UTIL_STATIC const char** UTIL_createFileList(const char **inputNames, unsigned inputNamesNb, char** allocatedBuffer, unsigned* allocatedNamesNb, int followLinks)
|
|
{
|
|
size_t pos;
|
|
unsigned i, nbFiles;
|
|
char* buf = (char*)malloc(LIST_SIZE_INCREASE);
|
|
char* bufend = buf + LIST_SIZE_INCREASE;
|
|
const char** fileTable;
|
|
|
|
if (!buf) return NULL;
|
|
|
|
for (i=0, pos=0, nbFiles=0; i<inputNamesNb; i++) {
|
|
if (!UTIL_isDirectory(inputNames[i])) {
|
|
size_t const len = strlen(inputNames[i]);
|
|
if (buf + pos + len >= bufend) {
|
|
ptrdiff_t newListSize = (bufend - buf) + LIST_SIZE_INCREASE;
|
|
buf = (char*)UTIL_realloc(buf, newListSize);
|
|
bufend = buf + newListSize;
|
|
if (!buf) return NULL;
|
|
}
|
|
if (buf + pos + len < bufend) {
|
|
strncpy(buf + pos, inputNames[i], bufend - (buf + pos));
|
|
pos += len + 1;
|
|
nbFiles++;
|
|
}
|
|
} else {
|
|
nbFiles += UTIL_prepareFileList(inputNames[i], &buf, &pos, &bufend, followLinks);
|
|
if (buf == NULL) return NULL;
|
|
} }
|
|
|
|
if (nbFiles == 0) { free(buf); return NULL; }
|
|
|
|
fileTable = (const char**)malloc((nbFiles+1) * sizeof(const char*));
|
|
if (!fileTable) { free(buf); return NULL; }
|
|
|
|
for (i=0, pos=0; i<nbFiles; i++) {
|
|
fileTable[i] = buf + pos;
|
|
pos += strlen(fileTable[i]) + 1;
|
|
}
|
|
|
|
if (buf + pos > bufend) { free(buf); free((void*)fileTable); return NULL; }
|
|
|
|
*allocatedBuffer = buf;
|
|
*allocatedNamesNb = nbFiles;
|
|
|
|
return fileTable;
|
|
}
|
|
|
|
|
|
UTIL_STATIC void UTIL_freeFileList(const char** filenameTable, char* allocatedBuffer)
|
|
{
|
|
if (allocatedBuffer) free(allocatedBuffer);
|
|
if (filenameTable) free((void*)filenameTable);
|
|
}
|
|
|
|
/* count the number of physical cores */
|
|
#if defined(_WIN32) || defined(WIN32)
|
|
|
|
#include <windows.h>
|
|
|
|
typedef BOOL(WINAPI* LPFN_GLPI)(PSYSTEM_LOGICAL_PROCESSOR_INFORMATION, PDWORD);
|
|
|
|
UTIL_STATIC int UTIL_countPhysicalCores(void)
|
|
{
|
|
static int numPhysicalCores = 0;
|
|
if (numPhysicalCores != 0) return numPhysicalCores;
|
|
|
|
{ LPFN_GLPI glpi;
|
|
BOOL done = FALSE;
|
|
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION buffer = NULL;
|
|
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION ptr = NULL;
|
|
DWORD returnLength = 0;
|
|
size_t byteOffset = 0;
|
|
|
|
glpi = (LPFN_GLPI)GetProcAddress(GetModuleHandle(TEXT("kernel32")),
|
|
"GetLogicalProcessorInformation");
|
|
|
|
if (glpi == NULL) {
|
|
goto failed;
|
|
}
|
|
|
|
while(!done) {
|
|
DWORD rc = glpi(buffer, &returnLength);
|
|
if (FALSE == rc) {
|
|
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
|
|
if (buffer)
|
|
free(buffer);
|
|
buffer = (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION)malloc(returnLength);
|
|
|
|
if (buffer == NULL) {
|
|
perror("zstd");
|
|
exit(1);
|
|
}
|
|
} else {
|
|
/* some other error */
|
|
goto failed;
|
|
}
|
|
} else {
|
|
done = TRUE;
|
|
}
|
|
}
|
|
|
|
ptr = buffer;
|
|
|
|
while (byteOffset + sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION) <= returnLength) {
|
|
|
|
if (ptr->Relationship == RelationProcessorCore) {
|
|
numPhysicalCores++;
|
|
}
|
|
|
|
ptr++;
|
|
byteOffset += sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION);
|
|
}
|
|
|
|
free(buffer);
|
|
|
|
return numPhysicalCores;
|
|
}
|
|
|
|
failed:
|
|
/* try to fall back on GetSystemInfo */
|
|
{ SYSTEM_INFO sysinfo;
|
|
GetSystemInfo(&sysinfo);
|
|
numPhysicalCores = sysinfo.dwNumberOfProcessors;
|
|
if (numPhysicalCores == 0) numPhysicalCores = 1; /* just in case */
|
|
}
|
|
return numPhysicalCores;
|
|
}
|
|
|
|
#elif defined(__APPLE__)
|
|
|
|
#include <sys/sysctl.h>
|
|
|
|
/* Use apple-provided syscall
|
|
* see: man 3 sysctl */
|
|
UTIL_STATIC int UTIL_countPhysicalCores(void)
|
|
{
|
|
static S32 numPhysicalCores = 0; /* apple specifies int32_t */
|
|
if (numPhysicalCores != 0) return numPhysicalCores;
|
|
|
|
{ size_t size = sizeof(S32);
|
|
int const ret = sysctlbyname("hw.physicalcpu", &numPhysicalCores, &size, NULL, 0);
|
|
if (ret != 0) {
|
|
if (errno == ENOENT) {
|
|
/* entry not present, fall back on 1 */
|
|
numPhysicalCores = 1;
|
|
} else {
|
|
perror("zstd: can't get number of physical cpus");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
return numPhysicalCores;
|
|
}
|
|
}
|
|
|
|
#elif defined(__linux__)
|
|
|
|
/* parse /proc/cpuinfo
|
|
* siblings / cpu cores should give hyperthreading ratio
|
|
* otherwise fall back on sysconf */
|
|
UTIL_STATIC int UTIL_countPhysicalCores(void)
|
|
{
|
|
static int numPhysicalCores = 0;
|
|
|
|
if (numPhysicalCores != 0) return numPhysicalCores;
|
|
|
|
numPhysicalCores = (int)sysconf(_SC_NPROCESSORS_ONLN);
|
|
if (numPhysicalCores == -1) {
|
|
/* value not queryable, fall back on 1 */
|
|
return numPhysicalCores = 1;
|
|
}
|
|
|
|
/* try to determine if there's hyperthreading */
|
|
{ FILE* const cpuinfo = fopen("/proc/cpuinfo", "r");
|
|
size_t const BUF_SIZE = 80;
|
|
char buff[BUF_SIZE];
|
|
|
|
int siblings = 0;
|
|
int cpu_cores = 0;
|
|
int ratio = 1;
|
|
|
|
if (cpuinfo == NULL) {
|
|
/* fall back on the sysconf value */
|
|
return numPhysicalCores;
|
|
}
|
|
|
|
/* assume the cpu cores/siblings values will be constant across all
|
|
* present processors */
|
|
while (!feof(cpuinfo)) {
|
|
if (fgets(buff, BUF_SIZE, cpuinfo) != NULL) {
|
|
if (strncmp(buff, "siblings", 8) == 0) {
|
|
const char* const sep = strchr(buff, ':');
|
|
if (*sep == '\0') {
|
|
/* formatting was broken? */
|
|
goto failed;
|
|
}
|
|
|
|
siblings = atoi(sep + 1);
|
|
}
|
|
if (strncmp(buff, "cpu cores", 9) == 0) {
|
|
const char* const sep = strchr(buff, ':');
|
|
if (*sep == '\0') {
|
|
/* formatting was broken? */
|
|
goto failed;
|
|
}
|
|
|
|
cpu_cores = atoi(sep + 1);
|
|
}
|
|
} else if (ferror(cpuinfo)) {
|
|
/* fall back on the sysconf value */
|
|
goto failed;
|
|
}
|
|
}
|
|
if (siblings && cpu_cores) {
|
|
ratio = siblings / cpu_cores;
|
|
}
|
|
failed:
|
|
fclose(cpuinfo);
|
|
return numPhysicalCores = numPhysicalCores / ratio;
|
|
}
|
|
}
|
|
|
|
#else
|
|
|
|
UTIL_STATIC int UTIL_countPhysicalCores(void)
|
|
{
|
|
/* assume 1 */
|
|
return 1;
|
|
}
|
|
|
|
#endif
|
|
|
|
#if defined (__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* UTIL_H_MODULE */
|