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| #include <sys/types.h>
#include <fcntl.h>
#include <semaphore.h>
#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string>
#define ALLOW_OTHER_PROCESS 0
class Semaphore {
public:
static const int WAIT_FOREVER = -1;
static int num;
protected:
sem_t id;
char name[20];
Semaphore() {
sprintf(name,"sem_%d",num);
num++;
if (num >= SEM_VALUE_MAX) {
printf("attention nombre maximal de semaphores atteint\n");
}
}
Semaphore(sem_t id) : id(id) { strcpy(name,"\0"); }
public:
virtual bool take(int to) { return (sem_wait(&id) == 0); }
void take() { take(WAIT_FOREVER); }
virtual void give() {
if (sem_post(&id) != 0)
perror("Semaphore::give() failure in sem_post\n");
}
virtual void flush() {
int tmp;
do {
sem_getvalue(&id,&tmp);
} while (tmp > 0);
}
virtual ~Semaphore() { sem_destroy(&id); }
};
int Semaphore::num = 1;
class Mutex : public Semaphore {
public:
Mutex() : Semaphore() {
if (sem_init(&id, ALLOW_OTHER_PROCESS, 1) < 0) {
perror("sem_init failure in Mutex()\n");
}
}
};
class CountSema : public Semaphore {
protected:
int count;
Mutex countMtx;
public:
CountSema(int init=0) : Semaphore() {
if (sem_init(&id, ALLOW_OTHER_PROCESS, init) < 0) {
perror("sem_init failure in CountSema()\n");
}
count = init;
}
virtual ~CountSema() { }
virtual bool take(int to) {
countMtx.take();
count--;
if (count < 0) {
countMtx.give();
if (sem_wait(&id) == 0) {
countMtx.take();
count++;
countMtx.give();
return false;
}
} else {
countMtx.give();
}
return true;
}
virtual void give() {
countMtx.take();
if (count < 0)
if (sem_post(&id) != 0) {
perror("sem_post failure in CountSema::give()\n");
}
count++;
countMtx.give();
}
virtual void flush() {
countMtx.take();
while (count > 0) {
if (sem_post(&id) != 0)
perror("CountSema::flush() failure in sem_post\n");
count--;
}
count = 0;
countMtx.give();
}
virtual int getCount() {
return count;
}
};
class BinSema : public Semaphore {
public:
BinSema(bool init=false) : Semaphore() {
if (sem_init(&id, ALLOW_OTHER_PROCESS, ((init) ? 1 : 0)) < 0) {
perror("sem_init failure in BinSema()\n");
}
;
}
};
static void* _c_run(void* pt);
class Thread {
public:
static int num;
protected:
const int stackSize;
int prio;
virtual void run() = 0;
pthread_t* id;
BinSema joinSem;
Mutex idMtx;
char name[20];
public:
Thread(int _prio, int _stackSize) : stackSize(_stackSize), prio(_prio), id(NULL) {
sprintf(name,"thread_%d",num);
}
virtual ~Thread() {
if (id != NULL) {
pthread_cancel(*id);
free(id);
}
joinSem.flush();
}
void start() {
idMtx.take();
if (id == NULL) {
id = (pthread_t*) malloc(sizeof(pthread_t));
if (pthread_create(id, NULL, _c_run, (void*) this) != 0) {
perror("Thread::start() failure in pthread_create\n");
free(id);
}
idMtx.give();
} else {
idMtx.give();
throw "Thread non demarre";
}
}
void join() {
idMtx.take();
if (id != 0) {
idMtx.give();
joinSem.take();
} else
idMtx.give();
}
friend void* _c_run(void* p);
};
int Thread::num = 1;
static void* _c_run(void* arg) {
Thread* pt = (Thread*) arg;
pt->run();
pt->joinSem.flush();
free(pt->id);
} |
[g++] problème avec les sémaphores
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Envoyé par Laurent Gomila
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