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- Improve compatibility with Blink virtual machine
- Add non-POSIX APIs for joining threads and signal masks
- Never ever use anything except 32-bit integers for atomics
- Add some `#undef` statements to workaround `ctags` problems
This commit is contained in:
Justine Tunney 2022-11-10 21:52:47 -08:00
parent b46ac13504
commit f2af97711b
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GPG key ID: BE714B4575D6E328
114 changed files with 902 additions and 363 deletions
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29
third_party/nsync/futex.c vendored
View file

@ -32,6 +32,7 @@
#include "libc/intrin/strace.internal.h"
#include "libc/intrin/weaken.h"
#include "libc/limits.h"
#include "libc/nexgen32e/vendor.internal.h"
#include "libc/nt/runtime.h"
#include "libc/nt/synchronization.h"
#include "libc/sysv/consts/clock.h"
@ -60,10 +61,15 @@ static bool futex_is_supported;
static bool futex_timeout_is_relative;
__attribute__((__constructor__)) static void nsync_futex_init_ (void) {
int e;
atomic_int x;
FUTEX_WAIT_ = FUTEX_WAIT;
if (IsGenuineCosmo ()) {
return;
}
if (IsWindows ()) {
futex_is_supported = true;
return;
@ -89,6 +95,7 @@ __attribute__((__constructor__)) static void nsync_futex_init_ (void) {
// configuring any time synchronization mechanism (like ntp) to
// adjust for leap seconds by adjusting the rate, rather than
// with a backwards step.
e = errno;
atomic_store_explicit (&x, 0, memory_order_relaxed);
if (IsLinux () &&
_futex (&x, FUTEX_WAIT_BITSET | FUTEX_CLOCK_REALTIME,
@ -110,6 +117,7 @@ __attribute__((__constructor__)) static void nsync_futex_init_ (void) {
FUTEX_WAIT_ = FUTEX_WAIT;
futex_timeout_is_relative = true;
}
errno = e;
}
static int nsync_futex_polyfill_ (atomic_int *w, int expect, struct timespec *abstime) {
@ -212,15 +220,21 @@ int nsync_futex_wait_ (atomic_int *w, int expect, char pshare, struct timespec *
struct PosixThread *pt = 0;
struct timespec tsmem, *timeout;
if (atomic_load_explicit (w, memory_order_acquire) != expect) {
return -EAGAIN;
}
op = FUTEX_WAIT_;
if (pshare == PTHREAD_PROCESS_PRIVATE) {
op |= FUTEX_PRIVATE_FLAG_;
}
if (abstime && timespec_cmp (*abstime, timespec_zero) <= 0) {
rc = -ETIMEDOUT;
goto Finished;
}
if (atomic_load_explicit (w, memory_order_acquire) != expect) {
rc = -EAGAIN;
goto Finished;
}
timeout = nsync_futex_timeout_ (&tsmem, abstime);
LOCKTRACE ("futex(%t [%d], %s, %#x, %s) → ...",
@ -275,11 +289,12 @@ int nsync_futex_wait_ (atomic_int *w, int expect, char pshare, struct timespec *
__get_tls()->tib_flags &= ~TIB_FLAG_TIME_CRITICAL;
}
Finished:
STRACE ("futex(%t [%d], %s, %#x, %s) → %s",
w, atomic_load_explicit (w, memory_order_relaxed),
DescribeFutexOp (op), expect,
DescribeTimespec (0, timeout),
DescribeErrnoResult (rc));
DescribeTimespec (0, abstime),
DescribeErrno (rc));
return rc;
}
@ -323,7 +338,7 @@ int nsync_futex_wake_ (atomic_int *w, int count, char pshare) {
STRACE ("futex(%t [%d], %s, %d) → %s",
w, atomic_load_explicit (w, memory_order_relaxed),
DescribeFutexOp(op), count, DescribeErrnoResult(rc));
DescribeFutexOp (op), count, DescribeErrno (rc));
return rc;
}