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Annotation of parser3/src/include/pa_threads.h, revision 1.16

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: 
1.16    ! parser      8:        $Id: pa_threads.h,v 1.15 2001/05/17 10:42:56 parser 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: #include "pa_types.h"
                     16: 
1.13      parser     17: class AutoSYNCHRONIZED;
                     18: 
1.7       paf        19: /// simple semaphore object
1.1       paf        20: class Mutex {
1.13      parser     21:        friend AutoSYNCHRONIZED;
                     22: private:
1.1       paf        23:        uint handle;
                     24: public:
                     25:        Mutex();
                     26:        ~Mutex();
1.13      parser     27: private: // for AutoSYNCHRONIZED
1.2       paf        28:        void acquire();
                     29:        void release();
1.1       paf        30: };
                     31: 
1.2       paf        32: extern Mutex global_mutex;
1.1       paf        33: 
1.8       paf        34: /** 
1.7       paf        35:        Helper to ensure paired Mutex::acquire() and Mutex::release().
                     36: 
                     37:        Use it with SYNCHRONIZED macro
                     38: */
1.2       paf        39: class AutoSYNCHRONIZED {
                     40: public:
1.13      parser     41:        AutoSYNCHRONIZED() { global_mutex.acquire(); }
                     42:        ~AutoSYNCHRONIZED() { global_mutex.release(); }
1.7       paf        43: };
                     44: 
1.8       paf        45: /** 
                     46:        put it to first line of a function to ensure thread safety.
1.7       paf        47:        @verbatim
1.13      parser     48:                void someclass::somefunc(...) { SYNCHRONIZED;
1.10      paf        49:                        ...
                     50:                }
1.7       paf        51:        @endverbatim
1.2       paf        52: 
1.13      parser     53:        WARNING: don't use THROW or PTHROW with such thread safety mechanizm -
1.15      parser     54:        longjmp would leave global_mutex acquired, which is wrong!
1.7       paf        55: */
1.16    ! parser     56: #define SYNCHRONIZED AutoSYNCHRONIZED autoSYNCHRONIZED
1.1       paf        57: 
                     58: #endif