mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-07-01 08:48:29 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Use futexes on OpenBSD and improve threading

Browse source
This commit is contained in:
Justine Tunney 2022-07-17 19:59:49 -07:00
parent 5b11033d4d
commit 4f4889ddf7
17 changed files with 114 additions and 63 deletions
Download patch file Download diff file Expand all files Collapse all files

24
libc/intrin/futex_wait.c
View file

@ -18,28 +18,16 @@
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/strace.internal.h"
#include "libc/calls/struct/timespec.h"
#include "libc/errno.h"
#include "libc/fmt/itoa.h"
#include "libc/dce.h"
#include "libc/intrin/describeflags.internal.h"
#include "libc/intrin/futex.internal.h"
#include "libc/mem/alloca.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/futex.h"
static const char *DescribeFutexWaitResult(char buf[12], int ax) {
const char *s;
if (ax && ((s = strerrno(ax)) || (s = strerrno(-ax)))) {
return s;
} else {
FormatInt32(buf, ax);
return buf;
}
}
int _futex(void *, int, int, struct timespec *) hidden;
int _futex_wait(void *addr, int expect, struct timespec *timeout) {
int ax;
ax = _futex(addr, FUTEX_WAIT, expect, timeout, 0);
STRACE("futex(%t[%p], FUTEX_WAIT, %d, %s) → %s", addr, addr, expect,
DescribeTimespec(0, timeout), DescribeFutexWaitResult(alloca(12), ax));
int ax = _futex(addr, FUTEX_WAIT, expect, timeout);
if (IsOpenbsd() && ax > 0) ax = -ax; // yes openbsd does this w/o cf
STRACE("futex(%t, FUTEX_WAIT, %d, %s) → %s", addr, expect,
DescribeTimespec(0, timeout), DescribeFutexResult(ax));
return ax;
}