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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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17
libc/thread/itimer.c
View file

@ -24,10 +24,12 @@
#include "libc/calls/struct/sigset.internal.h"
#include "libc/calls/struct/timeval.h"
#include "libc/cosmo.h"
#include "libc/intrin/maps.h"
#include "libc/intrin/strace.h"
#include "libc/nt/enum/processcreationflags.h"
#include "libc/nt/thread.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/clock.h"
#include "libc/sysv/consts/sicode.h"
#include "libc/sysv/consts/sig.h"
#include "libc/sysv/errfuns.h"
@ -36,11 +38,17 @@
#include "third_party/nsync/mu.h"
#ifdef __x86_64__
#define STACK_SIZE 65536
struct IntervalTimer __itimer;
static textwindows dontinstrument uint32_t __itimer_worker(void *arg) {
struct CosmoTib tls;
__bootstrap_tls(&tls, __builtin_frame_address(0));
char *sp = __builtin_frame_address(0);
__bootstrap_tls(&tls, sp);
__maps_track(
(char *)(((uintptr_t)sp + __pagesize - 1) & -__pagesize) - STACK_SIZE,
STACK_SIZE);
for (;;) {
bool dosignal = false;
struct timeval now, waituntil;
@ -66,11 +74,10 @@ static textwindows dontinstrument uint32_t __itimer_worker(void *arg) {
}
}
nsync_mu_unlock(&__itimer.lock);
if (dosignal) {
if (dosignal)
__sig_generate(SIGALRM, SI_TIMER);
}
nsync_mu_lock(&__itimer.lock);
nsync_cv_wait_with_deadline(&__itimer.cond, &__itimer.lock,
nsync_cv_wait_with_deadline(&__itimer.cond, &__itimer.lock, CLOCK_REALTIME,
timeval_totimespec(waituntil), 0);
nsync_mu_unlock(&__itimer.lock);
}
@ -78,7 +85,7 @@ static textwindows dontinstrument uint32_t __itimer_worker(void *arg) {
}
static textwindows void __itimer_setup(void) {
__itimer.thread = CreateThread(0, 65536, __itimer_worker, 0,
__itimer.thread = CreateThread(0, STACK_SIZE, __itimer_worker, 0,
kNtStackSizeParamIsAReservation, 0);
}