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package sync
import "core:sys/unix"
import "core:intrinsics"
current_thread_id :: proc "contextless" () -> int {
SYS_GETTID :: 186
return int(intrinsics.syscall(SYS_GETTID))
}
// The Darwin docs say it best:
// A semaphore is much like a lock, except that a finite number of threads can hold it simultaneously.
// Semaphores can be thought of as being much like piles of tokens; multiple threads can take these tokens,
// but when there are none left, a thread must wait until another thread returns one.
Semaphore :: struct #align 16 {
handle: unix.sem_t,
}
semaphore_init :: proc(s: ^Semaphore, initial_count := 0) {
assert(unix.sem_init(&s.handle, 0, u32(initial_count)) == 0)
}
semaphore_destroy :: proc(s: ^Semaphore) {
assert(unix.sem_destroy(&s.handle) == 0)
s.handle = {}
}
semaphore_post :: proc(s: ^Semaphore, count := 1) {
// NOTE: SPEED: If there's one syscall to do this, we should use it instead of the loop.
for in 0..<count {
assert(unix.sem_post(&s.handle) == 0)
}
}
semaphore_wait_for :: proc(s: ^Semaphore) {
assert(unix.sem_wait(&s.handle) == 0)
}
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