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Annotation of parser3/src/include/pa_threads.h, revision 1.37

1.7       paf         1: /** @file
1.9       paf         2:        Parser: mutex & helpers decls.
                      3: 
1.37    ! moko        4:        Copyright (c) 2001-2020 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: 
1.37    ! moko       11: #define IDENT_PA_THREADS_H "$Id: pa_threads.h,v 1.36 2020/12/15 11:28:40 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: 
1.36      moko       16: #ifdef _MSC_VER
                     17: #include <windows.h>
                     18: #endif
                     19: 
1.21      paf        20: /// get caller thread ID
1.35      moko       21: uint pa_get_thread_id();
1.1       paf        22: 
1.13      parser     23: class AutoSYNCHRONIZED;
                     24: 
1.7       paf        25: /// simple semaphore object
1.1       paf        26: class Mutex {
1.18      paf        27:        friend class AutoSYNCHRONIZED;
1.35      moko       28: 
1.36      moko       29: #ifdef _MSC_VER
1.35      moko       30: HANDLE handle;
                     31: #else
                     32: pthread_mutex_t handle;
                     33: #endif
                     34: 
1.1       paf        35: public:
                     36:        Mutex();
                     37:        ~Mutex();
1.13      parser     38: private: // for AutoSYNCHRONIZED
1.2       paf        39:        void acquire();
                     40:        void release();
1.1       paf        41: };
                     42: 
1.2       paf        43: extern Mutex global_mutex;
1.1       paf        44: 
1.8       paf        45: /** 
1.7       paf        46:        Helper to ensure paired Mutex::acquire() and Mutex::release().
                     47:        Use it with SYNCHRONIZED macro
                     48: */
1.35      moko       49: 
1.2       paf        50: class AutoSYNCHRONIZED {
                     51: public:
1.13      parser     52:        AutoSYNCHRONIZED() { global_mutex.acquire(); }
                     53:        ~AutoSYNCHRONIZED() { global_mutex.release(); }
1.7       paf        54: };
                     55: 
1.8       paf        56: /** 
                     57:        put it to first line of a function to ensure thread safety.
1.7       paf        58:        @verbatim
1.13      parser     59:                void someclass::somefunc(...) { SYNCHRONIZED;
1.10      paf        60:                        ...
                     61:                }
1.7       paf        62:        @endverbatim
1.2       paf        63: 
1.13      parser     64:        WARNING: don't use THROW or PTHROW with such thread safety mechanizm -
1.15      parser     65:        longjmp would leave global_mutex acquired, which is wrong!
1.7       paf        66: */
1.16      parser     67: #define SYNCHRONIZED AutoSYNCHRONIZED autoSYNCHRONIZED
1.1       paf        68: 
                     69: #endif