janwas
1c1200a049
- add translators from errno and GetLastError to LibError - clarified return values of callbacks (they must return INFO_CB_CONTINUE to continue) - this exposed a few bugs in error handling chains (returning incorrect values); also reduced say-nothing instances of return -1. - move CHECK_ERR etc. macros to lib_error This was SVN commit r3229.
119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
// partial pthread implementation for Win32
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//
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// Copyright (c) 2003-2005 Jan Wassenberg
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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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. See the GNU
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// General Public License for more details.
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//
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// Contact info:
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// Jan.Wassenberg@stud.uni-karlsruhe.de
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// http://www.stud.uni-karlsruhe.de/~urkt/
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// included by wposix.h and wpthread.cpp
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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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