Anonymous

#include <stdlib.h>#include <pthread.h>int main (int argc, char **argv){    pthread_mutex_t m=PTHREAD_MUTEX_INITIALIZER;    if(pthread_mutex_lock(&m)==0) printf("locked mutex\n");    else printf("failed to lock mutex\n"), exit(1);    if(pthread_mutex_trylock(&m)==0)        printf("locked again\n");    else printf("failed to lock again\n");    return 0;}---[root@grieg new]# rm -f t; gcc -o t t.c -lpthread; ldd t; ./t        libpthread.so.0 => /lib/tls/libpthread.so.0 (0x009bb000)        libc.so.6 => /lib/tls/libc.so.6 (0x007f5000)        /lib/ld-linux.so.2 (0x007dc000)locked mutexfailed to lock again---[root@grieg new]# rm -f t; gcc -o t t.c -pthread; ldd t; ./t        libpthread.so.0 => /lib/tls/libpthread.so.0 (0x009bb000)        libc.so.6 => /lib/tls/libc.so.6 (0x007f5000)        /lib/ld-linux.so.2 (0x007dc000)locked mutexfailed to lock again