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Get rid of kmalloc()

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This changes *NSYNC to allocate waiters on the stack so our locks don't
need to depend on dynamic memory. This make our runtiem simpler, and it
also fixes bugs with thread cancellation support.
This commit is contained in:
Justine Tunney 2023-09-11 21:34:53 -07:00
parent 77a7873057
commit a359de7893
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GPG key ID: BE714B4575D6E328
57 changed files with 405 additions and 472 deletions
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10
third_party/nsync/mu_semaphore_gcd.c vendored
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@ -41,6 +41,11 @@ static dispatch_semaphore_t dispatch_semaphore_create(long count) {
return (ds);
}
static void dispatch_release (dispatch_semaphore_t ds) {
__syslib->dispatch_release (ds);
STRACE ("dispatch_release(%#lx)", ds);
}
static long dispatch_semaphore_wait (dispatch_semaphore_t ds,
dispatch_time_t dt) {
long rc = __syslib->dispatch_semaphore_wait (ds, dt);
@ -65,6 +70,11 @@ void nsync_mu_semaphore_init_gcd (nsync_semaphore *s) {
*(dispatch_semaphore_t *)s = dispatch_semaphore_create (0);
}
/* Releases system resources associated with *s. */
void nsync_mu_semaphore_destroy_gcd (nsync_semaphore *s) {
dispatch_release (*(dispatch_semaphore_t *)s);
}
/* Wait until the count of *s exceeds 0, and decrement it. */
errno_t nsync_mu_semaphore_p_gcd (nsync_semaphore *s) {
dispatch_semaphore_wait (*(dispatch_semaphore_t *)s,