semaphores

["antreas z" <antreas_z at hotmail dot com>]

hi.I'm new to this project and i have much more to learn about it.But i have 
a very urgent question.When i try to compile the following code which is 
compiled succesfully on a Sun Unix maschine i get the following error
synch.h no such file
sys/ipc.h no such file
sema_t undeclared.
Can u tell me which libraries i have to work with so that i can use 
semaphores??
thanx.

#include <synch.h>
#include <sys/types.h>
#include <sys/ipc.h>

extern int errno;
main()
{
/*sema_t spreal; */
sema_t sp;
int retval;

 /* Initialize the semaphore. */
 retval = sema_init(&sp,2, USYNC_PROCESS, (void*)0 );
 if (retval != 0) {
	perror("Couldn't initialize.");
	exit(3);
 }

 retval = sema_trywait(&sp);
 printf("Did trywait. Returned %d >\n", retval); getchar();

 retval = sema_trywait(&sp);
 printf("Did trywait. Returned %d >\n", retval); getchar();

 retval = sema_trywait(&sp);
 printf("Did trywait. Returned %d >\n", retval); getchar();

 sema_destroy(&sp);

}



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