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Annotation of parser3/src/include/pa_threads.h, revision 1.18

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)
1.6       paf         5:        Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
1.5       paf         6: 
1.18    ! paf         7:        $Id: pa_threads.h,v 1.17 2001/09/26 10:32:25 parser Exp $
1.1       paf         8: */
                      9: 
                     10: #ifndef PA_THREADS_H
                     11: #define PA_THREADS_H
                     12: 
1.11      paf        13: #include "pa_config_includes.h"
1.1       paf        14: #include "pa_types.h"
                     15: 
1.13      parser     16: class AutoSYNCHRONIZED;
                     17: 
1.7       paf        18: /// simple semaphore object
1.1       paf        19: class Mutex {
1.18    ! paf        20:        friend class AutoSYNCHRONIZED;
1.13      parser     21: private:
1.1       paf        22:        uint handle;
                     23: public:
                     24:        Mutex();
                     25:        ~Mutex();
1.13      parser     26: private: // for AutoSYNCHRONIZED
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 {
                     39: public:
1.13      parser     40:        AutoSYNCHRONIZED() { global_mutex.acquire(); }
                     41:        ~AutoSYNCHRONIZED() { global_mutex.release(); }
1.7       paf        42: };
                     43: 
1.8       paf        44: /** 
                     45:        put it to first line of a function to ensure thread safety.
1.7       paf        46:        @verbatim
1.13      parser     47:                void someclass::somefunc(...) { SYNCHRONIZED;
1.10      paf        48:                        ...
                     49:                }
1.7       paf        50:        @endverbatim
1.2       paf        51: 
1.13      parser     52:        WARNING: don't use THROW or PTHROW with such thread safety mechanizm -
1.15      parser     53:        longjmp would leave global_mutex acquired, which is wrong!
1.7       paf        54: */
1.16      parser     55: #define SYNCHRONIZED AutoSYNCHRONIZED autoSYNCHRONIZED
1.1       paf        56: 
                     57: #endif