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Implement mpsc using semaphores.

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This commit is contained in:
Yifan Wu 2021-10-10 17:20:53 -07:00
parent 9bc1e8d2e9
commit 45c33f2ce2
8 changed files with 187 additions and 2 deletions
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15
user/src/syscall.rs
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@ -18,6 +18,9 @@ const SYSCALL_WAITTID: usize = 1002;
const SYSCALL_MUTEX_CREATE: usize = 1010;
const SYSCALL_MUTEX_LOCK: usize = 1011;
const SYSCALL_MUTEX_UNLOCK: usize = 1012;
const SYSCALL_SEMAPHORE_CREATE: usize = 1020;
const SYSCALL_SEMAPHORE_UP: usize = 1021;
const SYSCALL_SEMAPHORE_DOWN: usize = 1022;
fn syscall(id: usize, args: [usize; 3]) -> isize {
let mut ret: isize;
@ -113,3 +116,15 @@ pub fn sys_mutex_lock(id: usize) -> isize {
pub fn sys_mutex_unlock(id: usize) -> isize {
syscall(SYSCALL_MUTEX_UNLOCK, [id, 0, 0])
}
pub fn sys_semaphore_create(res_count: usize) -> isize {
syscall(SYSCALL_SEMAPHORE_CREATE, [res_count, 0, 0])
}
pub fn sys_semaphore_up(sem_id: usize) -> isize {
syscall(SYSCALL_SEMAPHORE_UP, [sem_id, 0, 0])
}
pub fn sys_semaphore_down(sem_id: usize) -> isize {
syscall(SYSCALL_SEMAPHORE_DOWN, [sem_id, 0, 0])
}