/*
	threads.h

	Portable threads and locks API

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*/

/**

@page threads Portable threads and locking support

The threads.h and threads.c code define the following portable API:

- THREAD_TYPE            portable thread type
- THREAD_ID              returns current thread ID of type THREAD_TYPE*
- THREAD_CREATE(t,f,a)   start a thread (THREAD_TYPE*)t that calls f(a)
- THREAD_DETACH(t)       detach thread (THREAD_TYPE*)t
- THREAD_JOIN(t)         wait to join (THREAD_TYPE*)t
- THREAD_EXIT            exit the current thread

- MUTEX_TYPE             portable mutex type
- MUTEX_INITIALIZER      global initializer value for static locks
- MUTEX_SETUP(m)         setup lock (MUTEX_TYPE*)m
- MUTEX_CLEANUP(m)       cleanup lock (MUTEX_TYPE*)m
- MUTEX_LOCK(m)          acquire lock (MUTEX_TYPE*)m
- MUTEX_UNLOCK(m)        release lock (MUTEX_TYPE*)m

- COND_TYPE		 portable condition variable type
- COND_SETUP(c)          setup condition variable (COND_TYPE*)c
- COND_CLEANUP(c)        cleanup condition variable (COND_TYPE*)c
- COND_SIGNAL(c)         signal condition variable (COND_TYPE*)c
- COND_WAIT(c,m)         wait on variable (COND_TYPE*)c in mutex (MUTEX_TYPE*)m

*/

#ifndef THREADS_H
#define THREADS_H

#ifndef WIN32
# include <unistd.h>	/* defines _POSIX_THREADS if pthreads are available */
#else
# define ssize_t int
# include <io.h>
# include <sys/types.h>
# include <process.h>
# include <windows.h>
#endif

#if defined(_POSIX_THREADS) || defined(_SC_THREADS)
# include <pthread.h>
#endif

/******************************************************************************\
 *
 *	Threads
 *
\******************************************************************************/

#if defined(WIN32)
# define THREAD_TYPE		HANDLE
# define THREAD_ID		GetCurrentThreadId()
# define THREAD_CREATE(x,y,z)	*(x) = (HANDLE)_beginthread((y), 8*4096, (z))
# define THREAD_DETACH(x)	
# define THREAD_JOIN(x)		WaitForSingleObject((x), INFINITE)
# define THREAD_EXIT		_endthread()
# define MUTEX_TYPE		HANDLE
# define MUTEX_INITIALIZER	CreateMutex(NULL, FALSE, NULL)
# define MUTEX_SETUP(x)		(x) = CreateMutex(NULL, FALSE, NULL)
# define MUTEX_CLEANUP(x)	CloseHandle(x)
# define MUTEX_LOCK(x)		WaitForSingleObject((x), INFINITE)
# define MUTEX_UNLOCK(x)	ReleaseMutex(x)
# define COND_SETUP(x)		emulate_pthread_cond_init(&(x))
# define COND_CLEANUP(x)	emulate_pthread_cond_destroy(&(x))
# define COND_SIGNAL(x)		emulate_pthread_cond_signal(&(x))
# define COND_WAIT(x,y)		emulate_pthread_cond_wait(&(x), &(y))
typedef struct
{ u_int waiters_count_;
  CRITICAL_SECTION waiters_count_lock_;
  HANDLE signal_event_;
} COND_TYPE;
#ifdef __cplusplus
extern "C" {
#endif
int emulate_pthread_cond_init(COND_TYPE*);
int emulate_pthread_cond_destroy(COND_TYPE*);
int emulate_pthread_cond_signal(COND_TYPE*);
int emulate_pthread_cond_wait(COND_TYPE*, MUTEX_TYPE*);
#ifdef __cplusplus
}
#endif
#elif defined(_POSIX_THREADS) || defined(_SC_THREADS)
# define THREAD_TYPE		pthread_t
# define THREAD_ID		pthread_self()
# define THREAD_CREATE(x,y,z)	pthread_create((x), NULL, (y), (z))
# define THREAD_DETACH(x)	pthread_detach((x))
# define THREAD_JOIN(x)		pthread_join((x), NULL)
# define THREAD_EXIT		pthread_exit(NULL)
# define MUTEX_TYPE		pthread_mutex_t
# define MUTEX_INITIALIZER	PTHREAD_MUTEX_INITIALIZER
# define MUTEX_SETUP(x)		pthread_mutex_init(&(x), NULL)
# define MUTEX_CLEANUP(x)	pthread_mutex_destroy(&(x))
#if 0 /* 1: DEBUG MUTEX */
# define MUTEX_LOCK(x)		(fprintf(stderr, "! LOCK   %p %s:%d\n", &x, __FILE__, __LINE__), pthread_mutex_lock(&(x)))
# define MUTEX_UNLOCK(x)	(fprintf(stderr, "! UNLOCK %p %s:%d\n", &x, __FILE__, __LINE__), pthread_mutex_unlock(&(x)))
#else
# define MUTEX_LOCK(x)		pthread_mutex_lock(&(x))
# define MUTEX_UNLOCK(x)	pthread_mutex_unlock(&(x))
#endif
# define COND_TYPE		pthread_cond_t
# define COND_SETUP(x)		pthread_cond_init(&(x), NULL)
# define COND_CLEANUP(x)	pthread_cond_destroy(&(x))
# define COND_SIGNAL(x)		pthread_cond_signal(&(x))
# define COND_WAIT(x,y)		pthread_cond_wait(&(x), &(y))
#else
# error "No POSIX threads detected: we need thread and mutex operations. See for example OpenSSL /threads/th-lock.c on how to implement mutex on your platform"
#endif

#endif
