Hi,
I always get the error message:"Operation not permitted" When I use
sem_init set pshared argument equal 1. Compiling as : "gcc -o sem_test
sem_test.c -lc_r". My freebsd ver is release 5.4 p6.
Test code appear below:
1 #include <sys/types.h>
2 #include <string.h>
3 #include <stdio.h>
4 #include <sys/stat.h>
5 #include <unistd.h>
6 #include <fcntl.h>
7 #include <errno.h>
8 #include <pthread.h>
9 #include <semaphore.h>
10
11 int main(int argc, char ** argv)
12 {
13 sem_t mutex;
14 if (-1 == sem_init (&mutex, 1, 1)) {
15 printf("sem init error:%s\n", strerror(errno));
16 exit(0);
17 }
18 sem_wait (&mutex);
19 printf("sem wait ok:\n");
20 sem_post (&mutex);
21 sem_destroy (&mutex);
22 return 0;
23 }
Best regards,
Gary Li
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