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Introduce pthread_condattr_setclock()

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This is one of the few POSIX APIs that was missing. It lets you choose a
monotonic clock for your condition variables. This might improve perf on
some platforms. It might also grant more flexibility with NTP configs. I
know Qt is one project that believes it needs this. To introduce this, I
needed to change some the *NSYNC APIs, to support passing a clock param.
There's also new benchmarks, demonstrating Cosmopolitan's supremacy over
many libc implementations when it comes to mutex performance. Cygwin has
an alarmingly bad pthread_mutex_t implementation. It is so bad that they
would have been significantly better off if they'd used naive spinlocks.
This commit is contained in:
Justine Tunney 2024-09-02 23:37:50 -07:00
parent 79516bf08e
commit 3c61a541bd
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GPG key ID: BE714B4575D6E328
55 changed files with 449 additions and 155 deletions
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11
third_party/nsync/testing/cv_test.c vendored
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@ -29,6 +29,7 @@
#include "third_party/nsync/testing/smprintf.h"
#include "third_party/nsync/testing/testing.h"
#include "third_party/nsync/testing/time_extra.h"
#include "libc/sysv/consts/clock.h"
#include "third_party/nsync/time.h"
/* --------------------------- */
@ -63,7 +64,7 @@ static int cv_queue_put (cv_queue *q, void *v, nsync_time abs_deadline) {
int wake = 0;
nsync_mu_lock (&q->mu);
while (q->count == q->limit &&
nsync_cv_wait_with_deadline (&q->non_full, &q->mu, abs_deadline, NULL) == 0) {
nsync_cv_wait_with_deadline (&q->non_full, &q->mu, CLOCK_REALTIME, abs_deadline, NULL) == 0) {
}
if (q->count != q->limit) {
int i = q->pos + q->count;
@ -91,7 +92,7 @@ static void *cv_queue_get (cv_queue *q, nsync_time abs_deadline) {
void *v = NULL;
nsync_mu_lock (&q->mu);
while (q->count == 0 &&
nsync_cv_wait_with_deadline (&q->non_empty, &q->mu, abs_deadline, NULL) == 0) {
nsync_cv_wait_with_deadline (&q->non_empty, &q->mu, CLOCK_REALTIME, abs_deadline, NULL) == 0) {
}
if (q->count != 0) {
v = q->data[q->pos];
@ -237,7 +238,7 @@ static void test_cv_deadline (testing t) {
nsync_time expected_end_time;
start_time = nsync_time_now ();
expected_end_time = nsync_time_add (start_time, nsync_time_ms (87));
if (nsync_cv_wait_with_deadline (&cv, &mu, expected_end_time,
if (nsync_cv_wait_with_deadline (&cv, &mu, CLOCK_REALTIME, expected_end_time,
NULL) != ETIMEDOUT) {
TEST_FATAL (t, ("nsync_cv_wait() returned non-expired for a timeout"));
}
@ -289,7 +290,7 @@ static void test_cv_cancel (testing t) {
cancel = nsync_note_new (NULL, expected_end_time);
x = nsync_cv_wait_with_deadline (&cv, &mu, future_time, cancel);
x = nsync_cv_wait_with_deadline (&cv, &mu, CLOCK_REALTIME, future_time, cancel);
if (x != ECANCELED) {
TEST_FATAL (t, ("nsync_cv_wait() returned non-cancelled (%d) for "
"a cancellation; expected %d",
@ -308,7 +309,7 @@ static void test_cv_cancel (testing t) {
/* Check that an already cancelled wait returns immediately. */
start_time = nsync_time_now ();
x = nsync_cv_wait_with_deadline (&cv, &mu, nsync_time_no_deadline, cancel);
x = nsync_cv_wait_with_deadline (&cv, &mu, CLOCK_REALTIME, nsync_time_no_deadline, cancel);
if (x != ECANCELED) {
TEST_FATAL (t, ("nsync_cv_wait() returned non-cancelled (%d) for "
"a cancellation; expected %d",