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Implement failsafe logic for posixSleep 

Now we'll sleep for the specified amount of time even though the number
of seconds doesn't fit in a `isize` field.
master
LemonBoy 2019-05-04 09:03:01 +02:00
parent b612512bb5
commit 98bc2b73bf
1 changed files with 18 additions and 6 deletions
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24
std/os/time.zig
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@ -3,6 +3,7 @@ const builtin = @import("builtin");
const Os = builtin.Os;
const debug = std.debug;
const testing = std.testing;
const math = std.math;
const windows = std.os.windows;
const linux = std.os.linux;
@ -30,16 +31,26 @@ pub fn sleep(nanoseconds: u64) void {
}
pub fn posixSleep(seconds: u63, nanoseconds: u63) void {
var req = posix.timespec{
.tv_sec = @intCast(isize, seconds),
.tv_nsec = @intCast(isize, nanoseconds),
};
var req: posix.timespec = undefined;
var rem: posix.timespec = undefined;
var req_sec = seconds;
var req_nsec = nanoseconds;
while (true) {
req.tv_sec = math.min(math.maxInt(isize), req_sec);
req.tv_nsec = @intCast(isize, req_nsec);
req_sec -= @intCast(u63, req.tv_sec);
req_nsec = 0;
const ret_val = posix.nanosleep(&req, &rem);
const err = posix.getErrno(ret_val);
if (err == 0) return;
switch (err) {
0 => {
// If there's still time to wait keep running the loop
if (req_sec == 0 and req_nsec == 0) return;
},
posix.EFAULT => unreachable,
posix.EINVAL => {
// Sometimes Darwin returns EINVAL for no reason.
@ -47,7 +58,8 @@ pub fn posixSleep(seconds: u63, nanoseconds: u63) void {
return;
},
posix.EINTR => {
req = rem;
req_sec += @intCast(u63, rem.tv_sec);
req_nsec = @intCast(u63, rem.tv_nsec);
continue;
},
else => return,