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Annotation of parser3/src/include/pa_threads.h, revision 1.35

1.7       paf         1: /** @file
1.9       paf         2:        Parser: mutex & helpers decls.
                      3: 
1.33      moko        4:        Copyright (c) 2001-2017 Art. Lebedev Studio (http://www.artlebedev.com)
1.23      paf         5:        Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.1       paf         6: */
                      7: 
                      8: #ifndef PA_THREADS_H
                      9: #define PA_THREADS_H
1.24      paf        10: 
1.35    ! moko       11: #define IDENT_PA_THREADS_H "$Id: pa_threads.h,v 1.34 2020/12/10 23:07:04 moko Exp $"
1.1       paf        12: 
1.11      paf        13: #include "pa_config_includes.h"
1.1       paf        14: #include "pa_types.h"
1.21      paf        15: 
                     16: /// get caller thread ID
1.35    ! moko       17: uint pa_get_thread_id();
1.1       paf        18: 
1.13      parser     19: class AutoSYNCHRONIZED;
                     20: 
1.7       paf        21: /// simple semaphore object
1.1       paf        22: class Mutex {
1.18      paf        23:        friend class AutoSYNCHRONIZED;
1.35    ! moko       24: 
        !            25: #ifdef WIN32
        !            26: HANDLE handle;
        !            27: #else
        !            28: pthread_mutex_t handle;
        !            29: #endif
        !            30: 
1.1       paf        31: public:
                     32:        Mutex();
                     33:        ~Mutex();
1.13      parser     34: private: // for AutoSYNCHRONIZED
1.2       paf        35:        void acquire();
                     36:        void release();
1.1       paf        37: };
                     38: 
1.2       paf        39: extern Mutex global_mutex;
1.1       paf        40: 
1.8       paf        41: /** 
1.7       paf        42:        Helper to ensure paired Mutex::acquire() and Mutex::release().
                     43:        Use it with SYNCHRONIZED macro
                     44: */
1.35    ! moko       45: 
1.2       paf        46: class AutoSYNCHRONIZED {
                     47: public:
1.13      parser     48:        AutoSYNCHRONIZED() { global_mutex.acquire(); }
                     49:        ~AutoSYNCHRONIZED() { global_mutex.release(); }
1.7       paf        50: };
                     51: 
1.8       paf        52: /** 
                     53:        put it to first line of a function to ensure thread safety.
1.7       paf        54:        @verbatim
1.13      parser     55:                void someclass::somefunc(...) { SYNCHRONIZED;
1.10      paf        56:                        ...
                     57:                }
1.7       paf        58:        @endverbatim
1.2       paf        59: 
1.13      parser     60:        WARNING: don't use THROW or PTHROW with such thread safety mechanizm -
1.15      parser     61:        longjmp would leave global_mutex acquired, which is wrong!
1.7       paf        62: */
1.16      parser     63: #define SYNCHRONIZED AutoSYNCHRONIZED autoSYNCHRONIZED
1.1       paf        64: 
                     65: #endif