unix/SysSemaphore.hpp

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/* REXX Unix Support                                                         */
/*                                                                           */
/* Semaphore support for Unix systems                                        */
/*                                                                           */
/*****************************************************************************/
 
#ifndef SysSemaphore_DEFINED
#define SysSemaphore_DEFINED
 
#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#include "rexx.h"
#include "SysDebug.hpp"
#include "Utilities.hpp"
 
class SysSemaphore {
public:
     SysSemaphore(const char *variable) : semVariable(variable), postedCount(0), created(false) { }
     SysSemaphore(const char *variable, bool);
     ~SysSemaphore() { ; }
     void create();
     inline void open() { ; }
     void close();
     void post();
     void wait(const char *ds, int di);
     bool wait(const char *ds, int di, uint32_t);
     void reset();
     inline bool posted() { return postedCount != 0; }
     inline void setSemVariable(const char *variable) { semVariable = variable; } // See RexxActivity::RexxActivity, must reassign, so public setter needed.
 
protected:
     const char *semVariable;
     pthread_cond_t  semCond;
     pthread_mutex_t semMutex;
     int postedCount;
     bool created;
};
 
class SysMutex {
public:
     SysMutex(const char *variable) : mutexVariable(variable), created(false) { ; }
     SysMutex(const char *, bool);
     ~SysMutex() { ; }
     void create();
     inline void open() { ; }
     void close();
     inline void request(const char *ds, int di)
     {
#ifdef CONCURRENCY_DEBUG
        if (Utilities::traceConcurrency())
        {
            struct ConcurrencyInfos concurrencyInfos;
            Utilities::GetConcurrencyInfos(concurrencyInfos);
            dbgprintf(CONCURRENCY_TRACE "...... ... (SysMutex)%s.request : before pthread_mutex_lock(0x%x) from %s (0x%x)\n", concurrencyInfos.threadId, concurrencyInfos.activation, concurrencyInfos.variableDictionary, concurrencyInfos.reserveCount, concurrencyInfos.lock, mutexVariable, &mutexMutex, ds, di);
        }
#endif
         pthread_mutex_lock(&mutexMutex);
#ifdef CONCURRENCY_DEBUG
        if (Utilities::traceConcurrency())
        {
            struct ConcurrencyInfos concurrencyInfos;
            Utilities::GetConcurrencyInfos(concurrencyInfos);
            dbgprintf(CONCURRENCY_TRACE "...... ... (SysMutex)%s.request : after pthread_mutex_lock(0x%x) from %s (0x%x)\n", concurrencyInfos.threadId, concurrencyInfos.activation, concurrencyInfos.variableDictionary, concurrencyInfos.reserveCount, concurrencyInfos.lock, mutexVariable, &mutexMutex, ds, di);
        }
#endif
     }
     inline void release(const char *ds, int di)
     {
#ifdef CONCURRENCY_DEBUG
        if (Utilities::traceConcurrency())
        {
            struct ConcurrencyInfos concurrencyInfos;
            Utilities::GetConcurrencyInfos(concurrencyInfos);
            dbgprintf(CONCURRENCY_TRACE "...... ... (SysMutex)%s.release : before pthread_mutex_unlock(0x%x) from %s (0x%x)\n", concurrencyInfos.threadId, concurrencyInfos.activation, concurrencyInfos.variableDictionary, concurrencyInfos.reserveCount, concurrencyInfos.lock, mutexVariable, &mutexMutex, ds, di);
        }
#endif
         pthread_mutex_unlock(&mutexMutex);
#ifdef CONCURRENCY_DEBUG
        if (Utilities::traceConcurrency())
        {
            struct ConcurrencyInfos concurrencyInfos;
            Utilities::GetConcurrencyInfos(concurrencyInfos);
            dbgprintf(CONCURRENCY_TRACE "...... ... (SysMutex)%s.release : after pthread_mutex_unlock(0x%x) from %s (0x%x)\n", concurrencyInfos.threadId, concurrencyInfos.activation, concurrencyInfos.variableDictionary, concurrencyInfos.reserveCount, concurrencyInfos.lock, mutexVariable, &mutexMutex, ds, di);
        }
#endif
     }
     inline bool requestImmediate(const char *ds, int di)
     {
#ifdef CONCURRENCY_DEBUG
        if (Utilities::traceConcurrency())
        {
            struct ConcurrencyInfos concurrencyInfos;
            Utilities::GetConcurrencyInfos(concurrencyInfos);
            dbgprintf(CONCURRENCY_TRACE "...... ... (SysMutex)%s.requestImmediate : before pthread_mutex_trylock(0x%x) from %s (0x%x)\n", concurrencyInfos.threadId, concurrencyInfos.activation, concurrencyInfos.variableDictionary, concurrencyInfos.reserveCount, concurrencyInfos.lock, mutexVariable, &mutexMutex, ds, di);
        }
#endif
         bool result = pthread_mutex_trylock(&mutexMutex) == 0;
#ifdef CONCURRENCY_DEBUG
        if (Utilities::traceConcurrency())
        {
            struct ConcurrencyInfos concurrencyInfos;
            Utilities::GetConcurrencyInfos(concurrencyInfos);
            dbgprintf(CONCURRENCY_TRACE "...... ... (SysMutex)%s.requestImmediate : after pthread_mutex_trylock(0x%x) from %s (0x%x)\n", concurrencyInfos.threadId, concurrencyInfos.activation, concurrencyInfos.variableDictionary, concurrencyInfos.reserveCount, concurrencyInfos.lock, mutexVariable, &mutexMutex, ds, di);
        }
#endif
         return result;
     }
 
protected:
     const char *mutexVariable;
     pthread_mutex_t mutexMutex;
     bool created;
};
#endif