157 lines
4.6 KiB
C
Executable File
157 lines
4.6 KiB
C
Executable File
/* Part of SWI-Prolog
|
|
|
|
Author: Jan Wielemaker
|
|
E-mail: J.Wielemaker@cs.vu.nl
|
|
WWW: http://www.swi-prolog.org
|
|
Copyright (C): 1985-2012, University of Amsterdam
|
|
VU University Amsterdam
|
|
|
|
This library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
This library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with this library; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef PL_THREAD_H_DEFINED
|
|
#define PL_THREAD_H_DEFINED
|
|
|
|
#ifdef THREADS
|
|
#include <pthread.h>
|
|
|
|
typedef pthread_mutex_t simpleMutex;
|
|
|
|
#define simpleMutexInit(p) pthread_mutex_init(p, NULL)
|
|
#define simpleMutexDelete(p) pthread_mutex_destroy(p)
|
|
#define simpleMutexLock(p) pthread_mutex_lock(p)
|
|
#define simpleMutexUnlock(p) pthread_mutex_unlock(p)
|
|
|
|
typedef pthread_mutex_t recursiveMutex;
|
|
|
|
#define NEED_RECURSIVE_MUTEX_INIT 1
|
|
extern int recursiveMutexInit(recursiveMutex *m);
|
|
#define recursiveMutexDelete(p) pthread_mutex_destroy(p)
|
|
#define recursiveMutexLock(p) pthread_mutex_lock(p)
|
|
#define recursiveMutexTryLock(p) pthread_mutex_trylock(p)
|
|
#define recursiveMutexUnlock(p) pthread_mutex_unlock(p)
|
|
|
|
|
|
typedef struct counting_mutex
|
|
{ simpleMutex mutex; /* mutex itself */
|
|
const char *name; /* name of the mutex */
|
|
long count; /* # times locked */
|
|
long unlocked; /* # times unlocked */
|
|
#ifdef O_CONTENTION_STATISTICS
|
|
long collisions; /* # contentions */
|
|
#endif
|
|
struct counting_mutex *next; /* next of allocated chain */
|
|
} counting_mutex;
|
|
|
|
extern counting_mutex *allocSimpleMutex(const char *name);
|
|
extern void freeSimpleMutex(counting_mutex *m);
|
|
|
|
extern counting_mutex _PL_mutexes[]; /* Prolog mutexes */
|
|
|
|
#define L_MISC 0
|
|
#define L_ALLOC 1
|
|
#define L_ATOM 2
|
|
#define L_FLAG 3
|
|
#define L_FUNCTOR 4
|
|
#define L_RECORD 5
|
|
#define L_THREAD 6
|
|
#define L_PREDICATE 7
|
|
#define L_MODULE 8
|
|
#define L_TABLE 9
|
|
#define L_BREAK 10
|
|
#define L_FILE 11
|
|
#define L_SEETELL 12
|
|
#define L_PLFLAG 13
|
|
#define L_OP 14
|
|
#define L_INIT 15
|
|
#define L_TERM 16
|
|
#define L_GC 17
|
|
#define L_AGC 18
|
|
#define L_STOPTHEWORLD 19
|
|
#define L_FOREIGN 20
|
|
#define L_OS 21
|
|
#define L_LOCALE 23
|
|
#ifdef __WINDOWS__
|
|
#define L_DDE 24
|
|
#define L_CSTACK 25
|
|
#endif
|
|
|
|
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
|
The IF_MT(id, g) macro is used to bypass mutexes if threading is
|
|
disabled. We cannot do this for the L_THREAD mutex however as we need to
|
|
control when threads can be created.
|
|
|
|
We assume id == L_THREAD is optimized away if id is known at
|
|
compile-time
|
|
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
|
|
#define IF_MT(id,g) g
|
|
//#define IF_MT(id, g) if ( id == L_THREAD ) g
|
|
|
|
#ifdef O_CONTENTION_STATISTICS
|
|
#define countingMutexLock(cm) \
|
|
do \
|
|
{ if ( pthread_mutex_trylock(&(cm)->mutex) == EBUSY ) \
|
|
{ (cm)->collisions++; \
|
|
pthread_mutex_lock(&(cm)->mutex); \
|
|
} \
|
|
(cm)->count++; \
|
|
} while(0)
|
|
#else
|
|
#define countingMutexLock(cm) \
|
|
do \
|
|
{ simpleMutexLock(&(cm)->mutex); \
|
|
(cm)->count++; \
|
|
} while(0)
|
|
#endif
|
|
#define countingMutexUnlock(cm) \
|
|
do \
|
|
{ (cm)->unlocked++; \
|
|
assert((cm)->unlocked <= (cm)->count); \
|
|
simpleMutexUnlock(&(cm)->mutex); \
|
|
} while(0)
|
|
|
|
//#define O_DEBUG_MT
|
|
#ifdef O_DEBUG_MT
|
|
#define PL_LOCK(id) \
|
|
do { Sdprintf("[%d] %s:%d: LOCK(%s)\n", \
|
|
pthread_self(), \
|
|
__BASE_FILE__, __LINE__, #id); \
|
|
countingMutexLock(&_PL_mutexes[id]); \
|
|
} while(0)
|
|
#define PL_UNLOCK(id) \
|
|
do { Sdprintf("[%d] %s:%d: UNLOCK(%s)\n", \
|
|
pthread_self(), \
|
|
__BASE_FILE__, __LINE__, #id); \
|
|
countingMutexUnlock(&_PL_mutexes[id]); \
|
|
} while(0)
|
|
#else
|
|
#define PL_LOCK(id) IF_MT(id, countingMutexLock(&_PL_mutexes[id]))
|
|
#define PL_UNLOCK(id) IF_MT(id, countingMutexUnlock(&_PL_mutexes[id]))
|
|
#endif
|
|
#undef O_DEBUG_MT
|
|
|
|
#define IOLOCK recursiveMutex
|
|
|
|
#else
|
|
#define PL_LOCK(X)
|
|
#define PL_UNLOCK(X)
|
|
|
|
typedef void * IOLOCK;
|
|
#endif
|
|
|
|
#endif
|
|
|
|
|