CODEWITHSUNDEEP
clinuxunixsemaphore
andandandand
andandandand

Reputation: 22260

Why is this semaphore code failing?

#include <semaphore.h>


sem_t mutex;


int main (int argc, char * argv[])
{



sem_init (&mutex,0,1); 

}

I'm getting: 

/tmp/ccAMFxDX.o: In function `main':
programaservidor.c:(.text+0x86): undefined reference to `sem_init'
collect2: ld returned 1 exit status

Upvotes: 2

Views: 6178

Answers (3)

R.. GitHub STOP HELPING ICE
R.. GitHub STOP HELPING ICE

Reputation: 215193

The relevant POSIX reference is:

http://www.opengroup.org/onlinepubs/9699919799/utilities/c99.html#tag_20_11_13

Upvotes: 0

icanhasserver
icanhasserver

Reputation: 1064

As stated in the man page, you have to link with either -lrt or -pthread.

Upvotes: 1

SiegeX
SiegeX

Reputation: 140227

Per the sem_init() man page

Link with -lrt or -pthread.

As in gcc your_code.c -lpthread -o your_code

Upvotes: 5

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