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