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ocaml/otherlibs/systhreads/win32.c

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/***********************************************************************/
/* */
/* Objective Caml */
/* */
/* Xavier Leroy and Pascal Cuoq, INRIA Rocquencourt */
/* */
/* Copyright 1995 Institut National de Recherche en Informatique et */
/* Automatique. Distributed only by permission. */
/* */
/***********************************************************************/
/* $Id$ */
/* Thread interface for Win32 threads */
#include <windows.h>
#include <signal.h>
#include "alloc.h"
#include "callback.h"
#include "fail.h"
#include "io.h"
#include "memory.h"
#include "misc.h"
#include "mlvalues.h"
#include "roots.h"
#include "signals.h"
#ifdef NATIVE_CODE
#include "stack.h"
#else
#include "stacks.h"
#endif
#include "sys.h"
/* Initial size of stack when a thread is created (4 Ko) */
#define Thread_stack_size (Stack_size / 4)
/* Max computation time before rescheduling, in microseconds (50ms) */
#define Thread_timeout 50000
/* Signal used for timer preemption (any unused, legal signal number) */
#define SIGTIMER SIGTERM
/* The ML value describing a thread (heap-allocated) */
struct caml_thread_handle {
value final_fun; /* Finalization function */
HANDLE handle; /* Windows handle */
};
struct caml_thread_descr {
value ident; /* Unique integer ID */
value start_closure; /* The closure to start this thread */
struct caml_thread_handle * thread_handle; /* Finalized object with handle */
};
#define Ident(v) (((struct caml_thread_descr *)(v))->ident)
#define Start_closure(v) (((struct caml_thread_descr *)(v))->start_closure)
#define Threadhandle(v) (((struct caml_thread_descr *)(v))->thread_handle)
/* The infos on threads (allocated via malloc()) */
struct caml_thread_struct {
HANDLE wthread; /* The Windows thread handle */
value descr; /* The heap-allocated descriptor */
struct caml_thread_struct * next; /* Double linking of running threads */
struct caml_thread_struct * prev;
#ifdef NATIVE_CODE
char * bottom_of_stack; /* Saved value of caml_bottom_of_stack */
unsigned long last_retaddr; /* Saved value of caml_last_return_address */
value * gc_regs; /* Saved value of caml_gc_regs */
char * exception_pointer; /* Saved value of caml_exception_pointer */
struct caml__roots_block * local_roots; /* Saved value of local_roots */
#else
value * stack_low; /* The execution stack for this thread */
value * stack_high;
value * stack_threshold;
value * sp; /* Saved value of extern_sp for this thread */
value * trapsp; /* Saved value of trapsp for this thread */
struct caml__roots_block * local_roots; /* Saved value of local_roots */
struct longjmp_buffer * external_raise; /* Saved external_raise */
#endif
};
typedef struct caml_thread_struct * caml_thread_t;
/* The descriptor for the currently executing thread (thread-specific) */
static __declspec( thread ) caml_thread_t curr_thread = NULL;
/* The global mutex used to ensure that at most one thread is running
Caml code */
static HANDLE caml_mutex;
/* The thread-specific variable holding last locked I/O channel */
static __declspec( thread ) struct channel * last_channel_locked = NULL;
/* Identifier for next thread creation */
static long thread_next_ident = 0;
/* Forward declarations */
static void caml_wthread_error (char * msg);
/* Hook for scanning the stacks of the other threads */
static void (*prev_scan_roots_hook) (scanning_action);
static void caml_thread_scan_roots(scanning_action action)
{
caml_thread_t th;
th = curr_thread;
do {
(*action)(th->descr, &th->descr);
/* Don't rescan the stack of the current thread, it was done already */
if (th != curr_thread) {
#ifdef NATIVE_CODE
if (th->bottom_of_stack != NULL)
do_local_roots(action, th->bottom_of_stack, th->last_retaddr,
th->gc_regs, th->local_roots);
#else
do_local_roots(action, th->sp, th->stack_high, th->local_roots);
#endif
}
th = th->next;
} while (th != curr_thread);
/* Hook */
if (prev_scan_roots_hook != NULL) (*prev_scan_roots_hook)(action);
}
/* Hooks for enter_blocking_section and leave_blocking_section */
static void (*prev_enter_blocking_section_hook) () = NULL;
static void (*prev_leave_blocking_section_hook) () = NULL;
static void caml_thread_enter_blocking_section(void)
{
if (prev_enter_blocking_section_hook != NULL)
(*prev_enter_blocking_section_hook)();
/* Save the stack-related global variables in the thread descriptor
of the current thread */
#ifdef NATIVE_CODE
curr_thread->bottom_of_stack = caml_bottom_of_stack;
curr_thread->last_retaddr = caml_last_return_address;
curr_thread->gc_regs = caml_gc_regs;
curr_thread->exception_pointer = caml_exception_pointer;
curr_thread->local_roots = local_roots;
#else
curr_thread->stack_low = stack_low;
curr_thread->stack_high = stack_high;
curr_thread->stack_threshold = stack_threshold;
curr_thread->sp = extern_sp;
curr_thread->trapsp = trapsp;
curr_thread->local_roots = local_roots;
curr_thread->external_raise = external_raise;
#endif
/* Release the global mutex */
ReleaseMutex(caml_mutex);
}
static void caml_thread_leave_blocking_section(void)
{
/* Re-acquire the global mutex */
WaitForSingleObject(caml_mutex, INFINITE);
/* Restore the stack-related global variables */
#ifdef NATIVE_CODE
caml_bottom_of_stack= curr_thread->bottom_of_stack;
caml_last_return_address = curr_thread->last_retaddr;
caml_gc_regs = curr_thread->gc_regs;
caml_exception_pointer = curr_thread->exception_pointer;
local_roots = curr_thread->local_roots;
#else
stack_low = curr_thread->stack_low;
stack_high = curr_thread->stack_high;
stack_threshold = curr_thread->stack_threshold;
extern_sp = curr_thread->sp;
trapsp = curr_thread->trapsp;
local_roots = curr_thread->local_roots;
external_raise = curr_thread->external_raise;
#endif
if (prev_leave_blocking_section_hook != NULL)
(*prev_leave_blocking_section_hook)();
}
/* Hooks for I/O locking */
static void caml_io_mutex_free(struct channel * chan)
{
HANDLE mutex = chan->mutex;
if (mutex != NULL) {
CloseHandle(mutex);
}
}
static void caml_io_mutex_lock(struct channel * chan)
{
if (chan->mutex == NULL) {
HANDLE mutex = CreateMutex(NULL, FALSE, NULL);
if (mutex == NULL) caml_wthread_error("Thread.iolock");
chan->mutex = (void *) mutex;
}
enter_blocking_section();
WaitForSingleObject((HANDLE) chan->mutex, INFINITE);
leave_blocking_section();
last_channel_locked = chan;
}
static void caml_io_mutex_unlock(struct channel * chan)
{
ReleaseMutex((HANDLE) chan->mutex);
last_channel_locked = NULL;
}
static void caml_io_mutex_unlock_exn(void)
{
if (last_channel_locked != NULL) caml_io_mutex_unlock(last_channel_locked);
}
/* The "tick" thread fakes a signal at regular intervals. */
static void * caml_thread_tick(void)
{
while(1) {
Sleep(Thread_timeout);
pending_signal = SIGTIMER;
#ifdef NATIVE_CODE
young_limit = young_end;
#else
something_to_do = 1;
#endif
}
}
static void caml_thread_finalize(value vthread)
{
CloseHandle(((struct caml_thread_handle *)vthread)->handle);
}
/* Initialize the thread machinery */
value caml_thread_initialize(value unit) /* ML */
{
value vthread = Val_unit;
value descr;
HANDLE tick_thread;
unsigned long tick_id;
Begin_root (vthread);
/* Initialize the main mutex and acquire it */
caml_mutex = CreateMutex(NULL, TRUE, NULL);
if (caml_mutex == NULL) caml_wthread_error("Thread.init");
/* Create a finalized value to hold thread handle */
vthread = alloc_final(sizeof(struct caml_thread_handle) / sizeof(value),
caml_thread_finalize, 1, 1000);
((struct caml_thread_handle *)vthread)->handle = NULL;
/* Create a descriptor for the current thread */
descr = alloc_tuple(sizeof(struct caml_thread_descr) / sizeof(value));
Ident(descr) = Val_long(thread_next_ident);
Start_closure(descr) = Val_unit;
Threadhandle(descr) = (struct caml_thread_handle *) vthread;
thread_next_ident++;
/* Create an info block for the current thread */
curr_thread =
(caml_thread_t) stat_alloc(sizeof(struct caml_thread_struct));
DuplicateHandle(GetCurrentProcess(), GetCurrentThread(),
GetCurrentProcess(), &(curr_thread->wthread),
0, FALSE, DUPLICATE_SAME_ACCESS);
if (curr_thread->wthread == NULL) caml_wthread_error("Thread.init");
((struct caml_thread_handle *)vthread)->handle = curr_thread->wthread;
curr_thread->descr = descr;
curr_thread->next = curr_thread;
curr_thread->prev = curr_thread;
/* The stack-related fields will be filled in at the next
enter_blocking_section */
/* Set up the hooks */
prev_scan_roots_hook = scan_roots_hook;
scan_roots_hook = caml_thread_scan_roots;
prev_enter_blocking_section_hook = enter_blocking_section_hook;
enter_blocking_section_hook = caml_thread_enter_blocking_section;
prev_leave_blocking_section_hook = leave_blocking_section_hook;
leave_blocking_section_hook = caml_thread_leave_blocking_section;
channel_mutex_free = caml_io_mutex_free;
channel_mutex_lock = caml_io_mutex_lock;
channel_mutex_unlock = caml_io_mutex_unlock;
channel_mutex_unlock_exn = caml_io_mutex_unlock_exn;
/* Fork the tick thread */
#if 0
tick_thread =
CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)&caml_thread_tick,
NULL, 0, &tick_id);
if (tick_thread == NULL) caml_wthread_error("Thread.init");
#endif
tick_thread = (HANDLE) _beginthread(caml_thread_tick, 0, NULL);
if (tick_thread == (HANDLE)(-1)) caml_wthread_error("Thread.init");
CloseHandle(tick_thread);
End_roots();
return Val_unit;
}
/* Create a thread */
static void caml_thread_start(caml_thread_t th)
{
value clos;
/* Initialize the per-thread variables */
curr_thread = th;
last_channel_locked = NULL;
/* Acquire the global mutex and set up the stack variables */
leave_blocking_section();
/* Callback the closure */
clos = Start_closure(th->descr);
Modify(&(Start_closure(th->descr)), Val_unit);
callback(clos, Val_unit);
/* Remove th from the doubly-linked list of threads */
th->next->prev = th->prev;
th->prev->next = th->next;
/* Release the main mutex (forever) */
enter_blocking_section();
#ifndef NATIVE_CODE
/* Free the memory resources */
stat_free(th->stack_low);
#endif
/* Free the thread descriptor */
stat_free(th);
/* The thread now stops running */
}
value caml_thread_new(value clos) /* ML */
{
caml_thread_t th;
value vthread = Val_unit;
value descr;
unsigned long th_id;
Begin_roots2 (clos, vthread)
/* Create a finalized value to hold thread handle */
vthread = alloc_final(sizeof(struct caml_thread_handle) / sizeof(value),
caml_thread_finalize, 1, 1000);
((struct caml_thread_handle *)vthread)->handle = NULL;
/* Create a descriptor for the new thread */
descr = alloc_tuple(sizeof(struct caml_thread_descr) / sizeof(value));
Ident(descr) = Val_long(thread_next_ident);
Start_closure(descr) = clos;
Threadhandle(descr) = (struct caml_thread_handle *) vthread;
thread_next_ident++;
/* Create an info block for the current thread */
th = (caml_thread_t) stat_alloc(sizeof(struct caml_thread_struct));
th->descr = descr;
#ifdef NATIVE_CODE
th->bottom_of_stack = NULL;
th->exception_pointer = NULL;
th->local_roots = NULL;
#else
/* Allocate the stacks */
th->stack_low = (value *) stat_alloc(Thread_stack_size);
th->stack_high = th->stack_low + Thread_stack_size / sizeof(value);
th->stack_threshold = th->stack_low + Stack_threshold / sizeof(value);
th->sp = th->stack_high;
th->trapsp = th->stack_high;
th->local_roots = NULL;
th->external_raise = NULL;
#endif
/* Add thread info block to the list of threads */
th->next = curr_thread->next;
th->prev = curr_thread;
curr_thread->next->prev = th;
curr_thread->next = th;
/* Fork the new thread */
#if 0
th->wthread =
CreateThread(NULL,0, (LPTHREAD_START_ROUTINE) caml_thread_start,
(void *) th, 0, &th_id);
if (th->wthread == NULL) {
#endif
th->wthread = (HANDLE) _beginthread(caml_thread_start, 0, (void *) th);
if (th->wthread == (HANDLE)(-1)) {
/* Fork failed, remove thread info block from list of threads */
th->next->prev = curr_thread;
curr_thread->next = th->next;
#ifndef NATIVE_CODE
stat_free(th->stack_low);
#endif
stat_free(th);
caml_wthread_error("Thread.create");
}
((struct caml_thread_handle *)vthread)->handle = th->wthread;
End_roots();
return descr;
}
/* Return the current thread */
value caml_thread_self(value unit) /* ML */
{
if (curr_thread == NULL) invalid_argument("Thread.self: not initialized");
return curr_thread->descr;
}
/* Return the identifier of a thread */
value caml_thread_id(value th) /* ML */
{
return Ident(th);
}
/* Allow re-scheduling */
value caml_thread_yield(value unit) /* ML */
{
enter_blocking_section();
Sleep(0);
leave_blocking_section();
return Val_unit;
}
/* Suspend the current thread until another thread terminates */
value caml_thread_join(value th) /* ML */
{
HANDLE h;
Begin_root(th) /* prevent deallocation of handle */
h = Threadhandle(th)->handle;
enter_blocking_section();
WaitForSingleObject(h, INFINITE);
leave_blocking_section();
End_roots();
return Val_unit;
}
/* Mutex operations */
#define Mutex_val(v) (*((HANDLE *)(&Field(v, 1))))
#define Max_mutex_number 1000
static void caml_mutex_finalize(value mut)
{
CloseHandle(Mutex_val(mut));
}
value caml_mutex_new(value unit) /* ML */
{
value mut;
mut = alloc_final(1 + sizeof(HANDLE) / sizeof(value),
caml_mutex_finalize, 1, Max_mutex_number);
Mutex_val(mut) = CreateMutex(0, FALSE, NULL);
if (Mutex_val(mut) == NULL) caml_wthread_error("Mutex.create");
return mut;
}
value caml_mutex_lock(value mut) /* ML */
{
int retcode;
Begin_root(mut) /* prevent deallocation of mutex */
enter_blocking_section();
retcode = WaitForSingleObject(Mutex_val(mut), INFINITE);
leave_blocking_section();
End_roots();
if (retcode == WAIT_FAILED) caml_wthread_error("Mutex.lock");
return Val_unit;
}
value caml_mutex_unlock(value mut) /* ML */
{
BOOL retcode;
Begin_root(mut) /* prevent deallocation of mutex */
enter_blocking_section();
retcode = ReleaseMutex(Mutex_val(mut));
leave_blocking_section();
End_roots();
if (!retcode) caml_wthread_error("Mutex.unlock");
return Val_unit;
}
value caml_mutex_try_lock(value mut) /* ML */
{
int retcode;
retcode = WaitForSingleObject(Mutex_val(mut), 0);
if (retcode == WAIT_FAILED || retcode == WAIT_ABANDONED)
caml_wthread_error("Mutex.try_lock");
return Val_bool(retcode == WAIT_OBJECT_0);
}
/* Delay */
value caml_thread_delay(value val) /* ML */
{
enter_blocking_section();
Sleep((DWORD)(Double_val(val)*1000)); /* milliseconds */
leave_blocking_section();
return Val_unit;
}
/* Conditions operations */
struct caml_condvar {
void (*final_fun)(); /* Finalization function */
unsigned long count; /* Number of waiting threads */
HANDLE sem; /* Semaphore on which threads are waiting */
};
#define Condition_val(v) ((struct caml_condvar *)(v))
#define Max_condition_number 1000
static void caml_condition_finalize(value cond)
{
CloseHandle(Condition_val(cond)->sem);
}
value caml_condition_new(value unit) /* ML */
{
value cond;
cond = alloc_final(sizeof(struct caml_condvar) / sizeof(value),
caml_condition_finalize, 1, Max_condition_number);
Condition_val(cond)->sem = CreateSemaphore(NULL, 0, 0x7FFFFFFF, NULL);
if (Condition_val(cond)->sem == NULL)
caml_wthread_error("Condition.create");
Condition_val(cond)->count = 0;
return cond;
}
value caml_condition_wait(value cond, value mut) /* ML */
{
int retcode;
HANDLE m = Mutex_val(mut);
HANDLE s = Condition_val(cond)->sem;
HANDLE handles[2];
Condition_val(cond)->count ++;
Begin_roots2(cond, mut) /* prevent deallocation of cond and mutex */
enter_blocking_section();
/* Release mutex */
ReleaseMutex(m);
/* Wait for semaphore to be non-null, and decrement it.
Simultaneously, re-acquire mutex. */
handles[0] = s;
handles[1] = m;
retcode = WaitForMultipleObjects(2, handles, TRUE, INFINITE);
leave_blocking_section();
End_roots();
if (retcode == WAIT_FAILED) caml_wthread_error("Condition.wait");
return Val_unit;
}
value caml_condition_signal(value cond) /* ML */
{
HANDLE s = Condition_val(cond)->sem;
if (Condition_val(cond)->count > 0) {
Condition_val(cond)->count --;
Begin_root(cond) /* prevent deallocation of cond */
enter_blocking_section();
/* Increment semaphore by 1, waking up one waiter */
ReleaseSemaphore(s, 1, NULL);
leave_blocking_section();
End_roots();
}
return Val_unit;
}
value caml_condition_broadcast(value cond) /* ML */
{
HANDLE s = Condition_val(cond)->sem;
unsigned long c = Condition_val(cond)->count;
if (c > 0) {
Condition_val(cond)->count = 0;
Begin_root(cond) /* prevent deallocation of cond */
enter_blocking_section();
/* Increment semaphore by c, waking up all waiters */
ReleaseSemaphore(s, c, NULL);
leave_blocking_section();
End_roots();
}
return Val_unit;
}
/* Synchronous signal wait */
static HANDLE wait_signal_event[NSIG];
static int * wait_signal_received[NSIG];
static void caml_wait_signal_handler(int signo)
{
*(wait_signal_received[signo]) = signo;
SetEvent(wait_signal_event[signo]);
}
typedef void (*sighandler_type)(int);
value caml_wait_signal(value sigs)
{
HANDLE event;
int res, s, retcode;
value l;
sighandler_type oldsignals[NSIG];
Begin_root(sigs);
event = CreateEvent(NULL, FALSE, FALSE, NULL);
if (event == NULL)
caml_wthread_error("Thread.wait_signal (CreateEvent)");
res = 0;
for (l = sigs; l != Val_int(0); l = Field(l, 1)) {
s = convert_signal_number(Int_val(Field(l, 0)));
oldsignals[s] = signal(s, caml_wait_signal_handler);
if (oldsignals[s] == SIG_ERR) {
CloseHandle(event);
caml_wthread_error("Thread.wait_signal (signal)");
}
wait_signal_event[s] = event;
wait_signal_received[s] = &res;
}
enter_blocking_section();
retcode = WaitForSingleObject(event, INFINITE);
leave_blocking_section();
for (l = sigs; l != Val_int(0); l = Field(l, 1)) {
s = convert_signal_number(Int_val(Field(l, 0)));
signal(s, oldsignals[s]);
}
CloseHandle(event);
End_roots();
if (retcode == WAIT_FAILED)
caml_wthread_error("Thread.wait_signal (WaitForSingleObject)");
return Val_int(res);
}
/* Error report */
static void caml_wthread_error(char * msg)
{
char errmsg[1024];
sprintf(errmsg, "%s: error code %x\n", msg, GetLastError());
raise_sys_error(copy_string(errmsg));
}
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