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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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9
libc/proc/proc.c
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@ -27,6 +27,7 @@
#include "libc/errno.h"
#include "libc/fmt/wintime.internal.h"
#include "libc/intrin/dll.h"
#include "libc/intrin/maps.h"
#include "libc/intrin/strace.h"
#include "libc/intrin/weaken.h"
#include "libc/mem/leaks.h"
@ -60,6 +61,8 @@
* @fileoverview Windows Subprocess Management.
*/
#define STACK_SIZE 65536
struct Procs __proc;
static textwindows void __proc_stats(int64_t h, struct rusage *ru) {
@ -130,7 +133,11 @@ textwindows int __proc_harvest(struct Proc *pr, bool iswait4) {
static textwindows dontinstrument uint32_t __proc_worker(void *arg) {
struct CosmoTib tls;
char *sp = __builtin_frame_address(0);
__bootstrap_tls(&tls, __builtin_frame_address(0));
__maps_track(
(char *)(((uintptr_t)sp + __pagesize - 1) & -__pagesize) - STACK_SIZE,
STACK_SIZE);
for (;;) {
// assemble a group of processes to wait on. if more than 64
@ -238,7 +245,7 @@ static textwindows dontinstrument uint32_t __proc_worker(void *arg) {
static textwindows void __proc_setup(void) {
__proc.onbirth = CreateEvent(0, 0, 0, 0); // auto reset
__proc.haszombies = CreateEvent(0, 1, 0, 0); // manual reset
__proc.thread = CreateThread(0, 65536, __proc_worker, 0,
__proc.thread = CreateThread(0, STACK_SIZE, __proc_worker, 0,
kNtStackSizeParamIsAReservation, 0);
}