121 lines
3.7 KiB
C
121 lines
3.7 KiB
C
/**
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* =========================================================================
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* File : wpthread.h
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* Project : 0 A.D.
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* Description : emulate pthreads on Windows.
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*
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* @author Jan.Wassenberg@stud.uni-karlsruhe.de
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* =========================================================================
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*/
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/*
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* Copyright (c) 2003-2005 Jan Wassenberg
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*
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* Redistribution and/or modification are also permitted under the
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* terms of the GNU General Public License as published by the
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* Free Software Foundation (version 2 or later, at your option).
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef WPTHREAD_H__
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#define WPTHREAD_H__
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#include "wtime.h" // sem_timedwait
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//
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// <sched.h>
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//
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struct sched_param
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{
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int sched_priority;
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};
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enum
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{
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SCHED_RR,
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SCHED_FIFO,
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SCHED_OTHER
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};
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// changing will break pthread_setschedparam:
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#define sched_get_priority_max(policy) +2
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#define sched_get_priority_min(policy) -2
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//
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// <pthread.h>
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//
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// one-time init
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typedef uintptr_t pthread_once_t;
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#define PTHREAD_ONCE_INIT 0 // static pthread_once_t x = PTHREAD_ONCE_INIT;
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extern int pthread_once(pthread_once_t*, void (*init_routine)(void));
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// thread
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typedef unsigned int pthread_t;
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extern pthread_t pthread_self(void);
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extern int pthread_getschedparam(pthread_t thread, int* policy, struct sched_param* param);
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extern int pthread_setschedparam(pthread_t thread, int policy, const struct sched_param* param);
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extern int pthread_create(pthread_t* thread, const void* attr, void* (*func)(void*), void* arg);
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extern int pthread_cancel(pthread_t thread);
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extern int pthread_join(pthread_t thread, void** value_ptr);
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// mutex
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typedef void* pthread_mutex_t; // pointer to critical section
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typedef void pthread_mutexattr_t;
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#define PTHREAD_MUTEX_INITIALIZER pthread_mutex_initializer()
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extern pthread_mutex_t pthread_mutex_initializer(void);
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extern int pthread_mutex_init(pthread_mutex_t*, const pthread_mutexattr_t*);
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extern int pthread_mutex_destroy(pthread_mutex_t*);
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extern int pthread_mutex_lock(pthread_mutex_t*);
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extern int pthread_mutex_trylock(pthread_mutex_t*);
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extern int pthread_mutex_unlock(pthread_mutex_t*);
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extern int pthread_mutex_timedlock(pthread_mutex_t*, const struct timespec*);
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// thread-local storage
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typedef unsigned int pthread_key_t;
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extern int pthread_key_create(pthread_key_t*, void (*dtor)(void*));
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extern int pthread_key_delete(pthread_key_t);
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extern void* pthread_getspecific(pthread_key_t);
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extern int pthread_setspecific(pthread_key_t, const void* value);
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//
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// <semaphore.h>
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//
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typedef uintptr_t sem_t;
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extern int sem_init(sem_t*, int pshared, unsigned value);
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extern int sem_post(sem_t*);
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extern int sem_wait(sem_t*);
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extern int sem_timedwait(sem_t*, const struct timespec*);
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extern int sem_destroy(sem_t*);
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// wait until semaphore is locked or a message arrives. non-portable.
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//
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// background: on Win32, UI threads must periodically pump messages, or
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// else deadlock may result (see WaitForSingleObject docs). that entails
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// avoiding any blocking functions. when event waiting is needed,
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// one cheap workaround would be to time out periodically and pump messages.
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// that would work, but either wastes CPU time waiting, or introduces
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// message latency. to avoid this, we provide an API similar to sem_wait and
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// sem_timedwait that gives MsgWaitForMultipleObjects functionality.
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//
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// return value: 0 if the semaphore has been locked (SUS terminology),
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// -1 otherwise. errno differentiates what happened: ETIMEDOUT if a
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// message arrived (this is to ease switching between message waiting and
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// periodic timeout), or an error indication.
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extern int sem_msgwait_np(sem_t* sem);
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#endif // #ifndef WPTHREAD_H__
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