int32
runtime·semasleep(int64 ns)
{
int32 ret;
int32 ms;
if(ns >= 0) {
// TODO: Plan 9 needs a new system call, tsemacquire.
// The kernel implementation is the same as semacquire
// except with a tsleep and check for timeout.
// It would be great if the implementation returned the
// value that was added to the semaphore, so that on
// timeout the return value would be 0, on success 1.
// Then the error string does not have to be parsed
// to detect timeout.
//
// If a negative time indicates no timeout, then
// semacquire can be implemented (in the kernel)
// as tsemacquire(p, v, -1).
runtime·throw("semasleep: timed sleep not implemented on Plan 9");
/*
if(ns < 0)
ms = -1;
else if(ns/1000 > 0x7fffffffll)
ms = 0x7fffffff;
else
ms = ns/1000;
ret = runtime·plan9_tsemacquire(&m->waitsemacount, 1, ms);
if(ret == 1)
return 0; // success
return -1; // timeout or interrupted
*/
}
while(runtime·plan9_semacquire(&m->waitsemacount, 1) < 0) {
/* interrupted; try again */
}
return 0; // success
}
int32
runtime·semasleep(int64 ns)
{
int32 ret;
int32 ms;
if(ns >= 0) {
if(ns/1000000 > 0x7fffffffll)
ms = 0x7fffffff;
else
ms = ns/1000000;
ret = runtime·plan9_tsemacquire(&m->waitsemacount, ms);
if(ret == 1)
return 0; // success
return -1; // timeout or interrupted
}
while(runtime·plan9_semacquire(&m->waitsemacount, 1) < 0) {
/* interrupted; try again (c.f. lock_sema.c) */
}
return 0; // success
}
