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Member "postal-0.76/mutex.cpp" (14 Jan 2003, 1233 Bytes) of package /linux/privat/postal-0.76.tgz:


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    1 #ifndef _GNU_SOURCE
    2 #define _GNU_SOURCE
    3 #endif
    4 
    5 #include "postal.h"
    6 #include "mutex.h"
    7 #include <stdio.h>
    8 #include <unistd.h>
    9 #include <stdlib.h>
   10 
   11 Mutex::Mutex(bool
   12 #ifdef LINUX_PTHREAD
   13  fastMutex
   14 #endif
   15  )
   16 {
   17   int rc;
   18 #ifdef LINUX_PTHREAD
   19   if(!fastMutex)
   20   {
   21     pthread_mutexattr_t attr;
   22     pthread_mutexattr_init(&attr);
   23     rc = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE_NP);
   24     if(!rc)
   25       rc = pthread_mutex_init(&m_mut, &attr);
   26     pthread_mutexattr_destroy(&attr);
   27   }
   28   else
   29 #endif
   30   {
   31     rc = pthread_mutex_init(&m_mut, NULL);
   32   }
   33   if(rc)
   34   {
   35     fprintf(stderr, "Can't create mutex.\n");
   36     exit(1);
   37   }
   38 }
   39 
   40 Mutex::~Mutex()
   41 {
   42   pthread_mutex_destroy(&m_mut);
   43 }
   44 
   45 int Mutex::get_mutex(bool block)
   46 {
   47   if(block)
   48   {
   49     if(pthread_mutex_lock(&m_mut))
   50       return -1;
   51   }
   52   else
   53   {
   54     if(pthread_mutex_trylock(&m_mut))
   55       return -1;
   56   }
   57   return 0;
   58 }
   59 
   60 int Mutex::put_mutex()
   61 {
   62   if(pthread_mutex_unlock(&m_mut))
   63     return -1;
   64   return 0;
   65 }
   66 
   67 Lock::Lock(Mutex &mut)
   68  : m_mut(mut)
   69 {
   70   if(m_mut.get_mutex())
   71   {
   72     perror("");
   73     fprintf(stderr, "Can't lock mutex.\n");
   74     exit(1);
   75   }
   76 }
   77 
   78 Lock::~Lock()
   79 {
   80   if(m_mut.put_mutex())
   81   {
   82     fprintf(stderr, "Can't unlock mutex.\n");
   83     exit(1);
   84   }
   85 }