uint32
runtime·mach_semcreate(void)
{
union {
Tmach_semcreateMsg tx;
Rmach_semcreateMsg rx;
uint8 pad[MinMachMsg];
} m;
int32 r;
m.tx.h.msgh_bits = 0;
m.tx.h.msgh_size = sizeof(m.tx);
m.tx.h.msgh_remote_port = runtime·mach_task_self();
m.tx.h.msgh_id = Tmach_semcreate;
m.tx.ndr = zerondr;
m.tx.policy = 0; // 0 = SYNC_POLICY_FIFO
m.tx.value = 0;
while((r = machcall(&m.tx.h, sizeof m, sizeof(m.rx))) != 0){
if(r == KERN_ABORTED) // interrupted
continue;
macherror(r, "semaphore_create");
}
if(m.rx.body.msgh_descriptor_count != 1)
unimplemented("mach_semcreate desc count");
return m.rx.semaphore.name;
}
void
runtime·mach_semrelease(uint32 sem)
{
int32 r;
while((r = runtime·mach_semaphore_signal(sem)) != 0) {
if(r == KERN_ABORTED) // interrupted
continue;
macherror(r, "semaphore_signal");
}
}
int32
runtime·mach_semacquire(uint32 sem, int64 ns)
{
int32 r;
if(ns >= 0) {
r = runtime·mach_semaphore_timedwait(sem, ns/1000000000LL, ns%1000000000LL);
if(r == KERN_ABORTED || r == KERN_OPERATION_TIMED_OUT)
return -1;
if(r != 0)
macherror(r, "semaphore_wait");
return 0;
}
while((r = runtime·mach_semaphore_wait(sem)) != 0) {
if(r == KERN_ABORTED) // interrupted
continue;
macherror(r, "semaphore_wait");
}
return 0;
}
void
mach_semacquire(uint32 sem)
{
int32 r;
while((r = mach_semaphore_wait(sem)) != 0) {
if(r == KERN_ABORTED) // interrupted
continue;
macherror(r, "semaphore_wait");
}
}
void
runtime·mach_semdestroy(uint32 sem)
{
union {
Tmach_semdestroyMsg tx;
uint8 pad[MinMachMsg];
} m;
int32 r;
m.tx.h.msgh_bits = MACH_MSGH_BITS_COMPLEX;
m.tx.h.msgh_size = sizeof(m.tx);
m.tx.h.msgh_remote_port = runtime·mach_task_self();
m.tx.h.msgh_id = Tmach_semdestroy;
m.tx.body.msgh_descriptor_count = 1;
m.tx.semaphore.name = sem;
m.tx.semaphore.disposition = MACH_MSG_TYPE_MOVE_SEND;
m.tx.semaphore.type = 0;
while((r = machcall(&m.tx.h, sizeof m, 0)) != 0){
if(r == KERN_ABORTED) // interrupted
continue;
macherror(r, "semaphore_destroy");
}
}
