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Annotation of parser3/src/include/pa_threads.h, revision 1.12

1.7       paf         1: /** @file
1.9       paf         2:        Parser: mutex & helpers decls.
                      3: 
1.5       paf         4:        Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.9       paf         5: 
1.6       paf         6:        Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
1.5       paf         7: 
1.12    ! paf         8:        $Id: pa_threads.h,v 1.11 2001/03/23 13:08:09 paf Exp $
1.1       paf         9: */
                     10: 
                     11: #ifndef PA_THREADS_H
                     12: #define PA_THREADS_H
                     13: 
1.11      paf        14: #include "pa_config_includes.h"
1.1       paf        15: 
                     16: #include "pa_types.h"
                     17: 
                     18: 
                     19: #ifdef MULTITHREAD
                     20: 
1.7       paf        21: /// simple semaphore object
1.1       paf        22: class Mutex {
                     23:        uint handle;
                     24: public:
                     25:        Mutex();
                     26:        ~Mutex();
1.2       paf        27:        void acquire();
                     28:        void release();
1.1       paf        29: };
                     30: 
1.2       paf        31: extern Mutex global_mutex;
1.1       paf        32: 
1.8       paf        33: /** 
1.7       paf        34:        Helper to ensure paired Mutex::acquire() and Mutex::release().
                     35: 
                     36:        Use it with SYNCHRONIZED macro
                     37: */
1.2       paf        38: class AutoSYNCHRONIZED {
1.3       paf        39:        bool thread_safe;
1.2       paf        40: public:
1.3       paf        41:        AutoSYNCHRONIZED(bool athread_safe) : thread_safe(athread_safe) { 
                     42:                if(thread_safe)
                     43:                        global_mutex.acquire(); 
                     44:        }
                     45:        ~AutoSYNCHRONIZED() { 
                     46:                if(thread_safe)
                     47:                        global_mutex.release(); 
                     48:        }
1.7       paf        49: };
                     50: 
1.8       paf        51: /** 
                     52:        put it to first line of a function to ensure thread safety.
1.7       paf        53:        @verbatim
1.10      paf        54:                void someclass::somefunc(...) { SYNCHRONIZED(thread_safe);
                     55:                        ...
                     56:                }
1.7       paf        57:        @endverbatim
1.2       paf        58: 
1.10      paf        59:        considering @a thread_safe to be the object field to flag 
1.7       paf        60:        whether safety is really needed in this particular object instance
                     61: */
1.4       paf        62: #define SYNCHRONIZED(athread_safe) AutoSYNCHRONIZED autoSYNCHRONIZED(athread_safe)
1.2       paf        63: 
1.12    ! paf        64: #define SYNCH_LOCK global_mutex.acqire()
        !            65: #define SYNCH_UNLOCK global_mutex.release()
        !            66: 
1.2       paf        67: #else // not MULTITHREAD-ed
                     68: 
1.4       paf        69: #define SYNCHRONIZED(athread_safe) /* do nothing */
1.12    ! paf        70: 
        !            71: #define SYNCH_LOCK 
        !            72: #define SYNCH_UNLOCK 
1.1       paf        73: 
                     74: #endif
1.2       paf        75: 
1.1       paf        76: 
                     77: #endif