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Make futexes cancellable by pthreads

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Justine Tunney 2022-11-04 18:19:05 -07:00
parent 2278327eba
commit 022536cab6
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GPG key ID: BE714B4575D6E328
101 changed files with 627 additions and 391 deletions
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5
third_party/nsync/mu.c vendored
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@ -15,6 +15,7 @@
│ See the License for the specific language governing permissions and │
│ limitations under the License. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/blockcancel.internal.h"
#include "libc/str/str.h"
#include "third_party/nsync/atomic.h"
#include "third_party/nsync/common.internal.h"
@ -52,6 +53,7 @@ void nsync_mu_lock_slow_ (nsync_mu *mu, waiter *w, uint32_t clear, lock_type *l_
uint32_t wait_count;
uint32_t long_wait;
unsigned attempts = 0; /* attempt count; used for spinloop backoff */
BLOCK_CANCELLATIONS;
w->cv_mu = NULL; /* not a cv wait */
w->cond.f = NULL; /* Not using a conditional critical section. */
w->cond.v = NULL;
@ -72,7 +74,7 @@ void nsync_mu_lock_slow_ (nsync_mu *mu, waiter *w, uint32_t clear, lock_type *l_
if (ATM_CAS_ACQ (&mu->word, old_word,
(old_word+l_type->add_to_acquire) &
~(clear|long_wait|l_type->clear_on_acquire))) {
return;
break;
}
} else if ((old_word&MU_SPINLOCK) == 0 &&
ATM_CAS_ACQ (&mu->word, old_word,
@ -126,6 +128,7 @@ void nsync_mu_lock_slow_ (nsync_mu *mu, waiter *w, uint32_t clear, lock_type *l_
}
attempts = nsync_spin_delay_ (attempts);
}
ALLOW_CANCELLATIONS;
}
/* Attempt to acquire *mu in writer mode without blocking, and return non-zero