mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-03-03 07:29:23 +00:00
47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
// clang-format off
|
|
/* Copyright 2016 Google Inc.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License. */
|
|
|
|
#ifndef NSYNC_INTERNAL_SEM_H_
|
|
#define NSYNC_INTERNAL_SEM_H_
|
|
|
|
/* A semaphore.
|
|
It may be counting or binary, and it need have no destructor. */
|
|
|
|
#include "libc/thread/nsync_time_internal.h"
|
|
#include "libc/thread/nsync_cpp.h"
|
|
|
|
NSYNC_CPP_START_
|
|
|
|
typedef struct nsync_semaphore_s_ {
|
|
void *sem_space[32]; /* space used by implementation */
|
|
} nsync_semaphore;
|
|
|
|
/* Initialize *s; the initial value is 0. */
|
|
void nsync_mu_semaphore_init (nsync_semaphore *s);
|
|
|
|
/* Wait until the count of *s exceeds 0, and decrement it. */
|
|
void nsync_mu_semaphore_p (nsync_semaphore *s);
|
|
|
|
/* Wait until one of:
|
|
the count of *s is non-zero, in which case decrement *s and return 0;
|
|
or abs_deadline expires, in which case return ETIMEDOUT. */
|
|
int nsync_mu_semaphore_p_with_deadline (nsync_semaphore *s, nsync_time abs_deadline);
|
|
|
|
/* Ensure that the count of *s is at least 1. */
|
|
void nsync_mu_semaphore_v (nsync_semaphore *s);
|
|
|
|
NSYNC_CPP_END_
|
|
|
|
#endif /*NSYNC_INTERNAL_SEM_H_*/
|