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Make fixes and improvements

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- clock_nanosleep() is now much faster on OpenBSD and NetBSD
- Thread joining is now much faster on NetBSD
- FreeBSD timestamps are now more accurate
- Thread spawning now goes faster on XNU
- Clean up the clone() code
This commit is contained in:
Justine Tunney 2022-11-08 10:09:47 -08:00
parent aee50b1327
commit b407327972
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GPG key ID: BE714B4575D6E328
47 changed files with 645 additions and 306 deletions
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30
third_party/nsync/futex.c vendored
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@ -16,6 +16,7 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/atomic.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
@ -111,29 +112,36 @@ __attribute__((__constructor__)) static void nsync_futex_init_ (void) {
}
}
static int nsync_futex_polyfill_ (atomic_int *w, int expect, struct timespec *timeout) {
static int nsync_futex_polyfill_ (atomic_int *w, int expect, struct timespec *abstime) {
int rc;
int64_t nanos, maxnanos;
struct timespec ts, deadline;
struct timespec now, wait, remain, deadline;
ts = timespec_real ();
if (!timeout) {
if (!abstime) {
deadline = timespec_max;
} else {
deadline = *timeout;
deadline = *abstime;
}
nanos = 100;
maxnanos = __SIG_POLLING_INTERVAL_MS * 1000L * 1000;
while (timespec_cmp (deadline, ts) > 0) {
ts = timespec_add (ts, timespec_fromnanos (nanos));
if (timespec_cmp (ts, deadline) > 0) {
ts = deadline;
}
for (;;) {
if (atomic_load_explicit (w, memory_order_acquire) != expect) {
return 0;
}
if ((rc = timespec_sleep_until (ts))) {
now = timespec_real ();
if (atomic_load_explicit (w, memory_order_acquire) != expect) {
return 0;
}
if (timespec_cmp (now, deadline) >= 0) {
break;
}
wait = timespec_fromnanos (nanos);
remain = timespec_sub (deadline, now);
if (timespec_cmp(wait, remain) > 0) {
wait = remain;
}
if ((rc = clock_nanosleep (CLOCK_REALTIME, 0, &wait, 0))) {
return -rc;
}
if (nanos < maxnanos) {