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Annotation of parser3/src/include/pa_threads.h, revision 1.8

1.7       paf         1: /** @file
1.5       paf         2:        Parser
                      3:        Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.6       paf         4:        Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
1.5       paf         5: 
1.8     ! paf         6:        $Id: pa_threads.h,v 1.7 2001/03/19 15:29:38 paf Exp $
1.1       paf         7: */
                      8: 
                      9: #ifndef PA_THREADS_H
                     10: #define PA_THREADS_H
                     11: 
                     12: #ifdef HAVE_CONFIG_H
                     13: #      include "pa_config.h"
                     14: #endif
                     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: 
                     54:        @verbatim
                     55:        void someclass::somefunc(...) { SYNCHRONIZED(thread_safe);
                     56:                ...
                     57:        }
                     58:        @endverbatim
1.2       paf        59: 
1.7       paf        60:        considering \a thread_safe to be the object field to flag 
                     61:        whether safety is really needed in this particular object instance
                     62: */
1.4       paf        63: #define SYNCHRONIZED(athread_safe) AutoSYNCHRONIZED autoSYNCHRONIZED(athread_safe)
1.2       paf        64: 
                     65: #else // not MULTITHREAD-ed
                     66: 
1.4       paf        67: #define SYNCHRONIZED(athread_safe) /* do nothing */
1.1       paf        68: 
                     69: #endif
1.2       paf        70: 
1.1       paf        71: 
                     72: #endif