Hi list.
I've jsut tried to compile a text book example for using semaphores on
linux, and I've failed measrably. looking in google for answers produced
nothing coherant, so I'm turning to you guys for help -
This code
--------------------
#include <sys/sem.h>
#include <assert.h>
class CCritical {
key_t m_Key;
int m_Semaphore;
public:
CCritical(char* pathname) {
union semun semopts;
m_Key = ftok(pathname,'l');
m_Semaphore = semget(m_Key, 1, IPC_CREAT|0666);
assert(m_Semaphore);
semopts.val = 0;
semctl(m_Semaphore, 0, SETVAL, semopts);
};
~CCritical() {
semctl(m_Key, 0, IPC_RMID, 0);
};
void lock() {
struct sembuf sem_lock={ 0, -1, IPC_NOWAIT};
sem_lock.sem_num = 0;
assert(semop(m_Semaphore, &sem_lock, 1) >= 0);
};
void unlock() {
struct sembuf sem_unlock={ 0, 1, IPC_NOWAIT};
sem_unlock.sem_num = 0;
assert(semop(m_Semaphore, &sem_unlock, 1) >= 0);
};
};
----------------
Got me this message :
LoggerStub.h:155: aggregate `semun semopts' has incomplete type and cannot
be initialized
LoggerStub.h:160: confused by earlier errors, bailing out
(don't mind line numbers - I've trimmed the file quite a bit)
I'm really confused as to what this means, and I'm clueless.
TIA
Oded
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