线程同步----递归锁 (四)

[cpp]
#include
#include
#include
#include

pthread_mutex_t lock;
int g_val0, g_val1;

int func(void)
{
int ret, val;
ret = pthread_mutex_lock(&lock);
if (ret)
printf("func:lock:%s\n", strerror(ret));
val = g_val1+8;
#if 1
ret = pthread_mutex_unlock(&lock);
if (ret)
printf("func:unlock%s\n", strerror(ret));
#endif
return val;
}

void * test0(void * arg)
{
int ret;

ret = pthread_mutex_lock(&lock);
if (ret)
printf("lock:%s\n", strerror(ret));

sleep(5);
g_val0 = func();
printf("res=%d\n", g_val0);
ret = pthread_mutex_unlock(&lock);
if (ret)
printf("unlock%s\n", strerror(ret));

return NULL;
}

void * test1(void * arg)
{
sleep(1);

#if 1
int ret = pthread_mutex_lock(&lock);
if (ret)
printf("1:%s\n", strerror(ret));
printf("g_val0=%d\n", g_val0);

ret = pthread_mutex_unlock(&lock);
if (ret)
printf("1:unlock%s\n", strerror(ret));
#endif
return NULL;
}

int main(void)
{
int ret;
pthread_t tid[2];
pthread_attr_t attr;
pthread_mutexattr_t mutexattr;

pthread_attr_init(&attr);
pthread_mutexattr_init(&mutexattr);

pthread_attr_setdetachstate(&attr,
PTHREAD_CREATE_DETACHED);
pthread_mutexattr_settype(&mutexattr,
PTHREAD_MUTEX_RECURSIVE_NP);

pthread_mutex_init(&lock, &mutexattr);
pthread_mutexattr_destroy(&mutexattr);



ret = pthread_create(&tid[0], &attr,
test0, NULL);
if (ret) {
fprintf(stderr, "create:%s\n", strerror(ret));
exit(1);
}

ret = pthread_create(&tid[0], &attr,
test1, NULL);
if (ret) {
fprintf(stderr, "create:%s\n", strerror(ret));
exit(1);
}

pthread_attr_destroy(&attr);

pthread_exit(NULL);
}

#include
#include
#include
#include

pthread_mutex_t lock;
int g_val0, g_val1;

int func(void)
{
int ret, val;
ret = pthread_mutex_lock(&lock);
if (ret)
printf("func:lock:%s\n", strerror(ret));
val = g_val1+8;
#if 1
ret = pthread_mutex_unlock(&lock);
if (ret)
printf("func:unlock%s\n", strerror(ret));
#endif
return val;
}

void * test0(void * arg)
{
int ret;

ret = pthread_mutex_lock(&lock);
if (ret)
printf("lock:%s\n", strerror(ret));

sleep(5);
g_val0 = func();
printf("res=%d\n", g_val0);
ret = pthread_mutex_unlock(&lock);
if (ret)
printf("unlock%s\n", strerror(ret));

return NULL;
}

void * test1(void * arg)
{
sleep(1);

#if 1
int ret = pthread_mutex_lock(&lock);
if (ret)
printf("1:%s\n", strerror(ret));
printf("g_val0=%d\n", g_val0);

ret = pthread_mutex_unlock(&lock);
if (ret)
printf("1:unlock%s\n", strerror(ret));
#endif
return NULL;
}

int main(void)
{
int ret;
pthread_t tid[2];
pthread_attr_t attr;
pthread_mutexattr_t mutexattr;

pthread_attr_init(&attr);
pthread_mutexattr_init(&mutexattr);

pthread_attr_setdetachstate(&attr,
PTHREAD_CREATE_DETACHED);
pthread_mutexattr_settype(&mutexattr,
PTHREAD_MUTEX_RECURSIVE_NP);

pthread_mutex_init(&lock, &mutexattr);
pthread_mutexattr_destroy(&mutexattr);

ret = pthread_creat