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Make spin locks go faster

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This commit is contained in:
Justine Tunney 2024-07-25 17:14:30 -07:00
parent a31d5ea399
commit c8e25d811c
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GPG key ID: BE714B4575D6E328
16 changed files with 150 additions and 123 deletions
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32
libc/runtime/at_quick_exit.c
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@ -21,30 +21,46 @@
#include "libc/runtime/runtime.h"
#include "libc/thread/thread.h"
static void (*funcs[32])(void);
static int count;
static pthread_spinlock_t lock;
pthread_spinlock_t *const __at_quick_exit_lockptr = &lock;
static void (*funcs[32])(void);
static pthread_mutex_t __quick_exit_lock_obj;
static void __quick_exit_wipe(void) {
pthread_mutex_init(&__quick_exit_lock_obj, 0);
}
static void __quick_exit_lock(void) {
pthread_mutex_lock(&__quick_exit_lock_obj);
}
static void __quick_exit_unlock(void) {
pthread_mutex_unlock(&__quick_exit_lock_obj);
}
void __funcs_on_quick_exit(void) {
void (*func)(void);
pthread_spin_lock(&lock);
__quick_exit_lock();
while (count) {
func = funcs[--count];
pthread_spin_unlock(&lock);
__quick_exit_unlock();
func();
pthread_spin_lock(&lock);
__quick_exit_lock();
}
}
int at_quick_exit(void func(void)) {
int res = 0;
pthread_spin_lock(&lock);
__quick_exit_lock();
if (count == ARRAYLEN(funcs)) {
res = -1;
} else {
funcs[count++] = func;
}
pthread_spin_unlock(&lock);
__quick_exit_unlock();
return res;
}
__attribute__((__constructor__(10))) textstartup void __quick_exit_init(void) {
pthread_atfork(__quick_exit_lock, __quick_exit_unlock, __quick_exit_wipe);
__quick_exit_wipe();
}