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47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
// clang-format off
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/* Copyright 2016 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License. */
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#ifndef NSYNC_INTERNAL_SEM_H_
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#define NSYNC_INTERNAL_SEM_H_
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/* A semaphore.
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It may be counting or binary, and it need have no destructor. */
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#include "libc/thread/nsync_time_internal.h"
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#include "libc/thread/nsync_cpp.h"
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NSYNC_CPP_START_
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typedef struct nsync_semaphore_s_ {
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void *sem_space[32]; /* space used by implementation */
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} nsync_semaphore;
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/* Initialize *s; the initial value is 0. */
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void nsync_mu_semaphore_init (nsync_semaphore *s);
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/* Wait until the count of *s exceeds 0, and decrement it. */
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void nsync_mu_semaphore_p (nsync_semaphore *s);
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/* Wait until one of:
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the count of *s is non-zero, in which case decrement *s and return 0;
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or abs_deadline expires, in which case return ETIMEDOUT. */
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int nsync_mu_semaphore_p_with_deadline (nsync_semaphore *s, nsync_time abs_deadline);
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/* Ensure that the count of *s is at least 1. */
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void nsync_mu_semaphore_v (nsync_semaphore *s);
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NSYNC_CPP_END_
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#endif /*NSYNC_INTERNAL_SEM_H_*/
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