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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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3
third_party/nsync/mem/nsync_mu_wait.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 "third_party/nsync/atomic.h"
#include "third_party/nsync/common.internal.h"
#include "third_party/nsync/dll.h"
@ -153,6 +154,7 @@ int nsync_mu_wait_with_deadline (nsync_mu *mu,
/* Work out in which mode the lock is held. */
uint32_t old_word;
IGNORE_RACES_START ();
BLOCK_CANCELLATIONS; /* not supported yet */
old_word = ATM_LOAD (&mu->word);
if ((old_word & MU_ANY_LOCK) == 0) {
nsync_panic_ ("nsync_mu not held in some mode when calling "
@ -265,6 +267,7 @@ int nsync_mu_wait_with_deadline (nsync_mu *mu,
if (condition_is_true) {
outcome = 0; /* condition is true trumps other outcomes. */
}
ALLOW_CANCELLATIONS;
IGNORE_RACES_END ();
return (outcome);
}