mirror of
https://github.com/ziglang/zig.git
synced 2024-11-30 17:12:31 +00:00
Definition fixups & ResetEvent test cases
This commit is contained in:
kprotty
Andrew Kelley
parent
9bce97a479
commit
ef208fee3c
@ -220,7 +220,7 @@ pub extern "c" fn pthread_mutex_destroy(mutex: *pthread_mutex_t) c_int;
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pub const PTHREAD_COND_INITIALIZER = pthread_cond_t{};
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pub extern "c" fn pthread_cond_wait(noalias cond: *pthread_cond_t, noalias mutex: *pthread_mutex_t) c_int;
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pub extern "c" fn pthread_cond_timedwait(noalias: cond: *pthread_cond_t, noalias: mutex: *pthread_mutex_t, noalias abstime: *const timespec) c_int;
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pub extern "c" fn pthread_cond_timedwait(noalias cond: *pthread_cond_t, noalias mutex: *pthread_mutex_t, noalias abstime: *const timespec) c_int;
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pub extern "c" fn pthread_cond_signal(cond: *pthread_cond_t) c_int;
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pub extern "c" fn pthread_cond_destroy(cond: *pthread_cond_t) c_int;
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@ -4,9 +4,10 @@ const testing = std.testing;
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const assert = std.debug.assert;
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const Backoff = std.SpinLock.Backoff;
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const c = std.c;
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const os = std.os;
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const time = std.time;
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const linux = std.os.linux;
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const windows = std.os.windows;
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const linux = os.linux;
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const windows = os.windows;
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/// A resource object which supports blocking until signaled.
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/// Once finished, the `deinit()` method should be called for correctness.
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@ -23,15 +24,15 @@ pub const ResetEvent = struct {
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}
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/// Returns whether or not the event is currenetly set
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pub fn isSet(self: *const ResetEvent) bool {
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pub fn isSet(self: *ResetEvent) bool {
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return self.os_event.isSet();
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}
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/// Sets the event if not already set and
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/// wakes up AT LEAST one thread waiting the event.
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/// Returns whether or not a thread was woken up.
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pub fn set(self: *ResetEvent) bool {
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return self.os_event.set();
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pub fn set(self: *ResetEvent, auto_reset: bool) bool {
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return self.os_event.set(auto_reset);
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}
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/// Resets the event to its original, unset state.
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@ -73,15 +74,15 @@ const DebugEvent = struct {
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self.* = undefined;
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}
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pub fn isSet(self: *const DebugEvent) bool {
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pub fn isSet(self: *DebugEvent) bool {
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if (!std.debug.runtime_safety)
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return true;
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return self.is_set;
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}
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pub fn set(self: *DebugEvent) bool {
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pub fn set(self: *DebugEvent, auto_reset: bool) bool {
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if (std.debug.runtime_safety)
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self.is_set = true;
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self.is_set = !auto_reset;
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return false;
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}
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@ -100,102 +101,87 @@ const DebugEvent = struct {
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}
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};
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fn EventState(comptime TagType: type) type {
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return enum(TagType) {
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Empty,
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Waiting,
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Signaled,
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fn AtomicEvent(comptime FutexImpl: type) type {
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return struct {
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state: u32,
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const IS_SET: u32 = 1 << 0;
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const WAIT_MASK = ~IS_SET;
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pub const Self = @This();
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pub const Futex = FutexImpl;
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pub fn init() Self {
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return Self{ .state = 0 };
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}
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pub fn deinit(self: *Self) void {
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self.* = undefined;
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}
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pub fn isSet(self: *const Self) bool {
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const state = @atomicLoad(u32, &self.state, .Acquire);
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return (state & IS_SET) != 0;
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}
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pub fn reset(self: *Self) bool {
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const old_state = @atomicRmw(u32, &self.state, .Xchg, 0, .Monotonic);
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return (old_state & IS_SET) != 0;
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}
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pub fn set(self: *Self, auto_reset: bool) bool {
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const new_state = if (auto_reset) 0 else IS_SET;
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const old_state = @atomicRmw(u32, &self.state, .Xchg, new_state, .Release);
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if ((old_state & WAIT_MASK) == 0) {
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return false;
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}
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Futex.wake(&self.state);
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return true;
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}
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pub fn wait(self: *Self, timeout: ?u64) ResetEvent.WaitError!bool {
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var dummy_value: u32 = undefined;
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const wait_token = @truncate(u32, @ptrToInt(&dummy_value));
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var state = @atomicLoad(u32, &self.state, .Monotonic);
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while (true) {
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if ((state & IS_SET) != 0)
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return false;
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state = @cmpxchgWeak(u32, &self.state, state, wait_token, .Acquire, .Monotonic) orelse break;
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}
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try Futex.wait(&self.state, wait_token, timeout);
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return true;
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}
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};
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}
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const SpinEvent = struct {
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state: State,
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const SpinEvent = AtomicEvent(struct {
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fn wake(ptr: *const u32) void {}
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const State = EventState(u8);
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pub fn init() SpinEvent {
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return SpinEvent{ .state = .Empty };
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}
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pub fn deinit(self: *SpinEvent) void {
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self.* = undefined;
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}
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pub fn isSet(self: *const SpinEvent) bool {
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return @atomicLoad(State, &self.state, .Acquire) == .Signaled;
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}
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pub fn set(self: *SpinEvent) bool {
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return @atomicRmw(State, &self.state, .Xchg, .Signaled, .Release) == .Waiting;
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}
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pub fn reset(self: *SpinEvent) bool {
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return @atomicRmw(State, &self.state, .Xchg, .Empty, .Monotonic) == .Signaled;
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}
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pub fn wait(self: *SpinEvent, timeout: ?u64) ResetEvent.WaitError!bool {
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var state = @atomicLoad(State, &self.state, .Monotonic);
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while (true) {
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switch (state) {
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.Empty => state = @cmpxchgWeak(State, &self.state, state, .Waiting, .Acquire, .Monotonic) orelse break,
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.Waiting => break,
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.Signaled => return false,
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}
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}
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// TODO: handle case for time.Timer.start() fails
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fn wait(ptr: *const u32, expected: u32, timeout: ?u64) ResetEvent.WaitError!void {
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// TODO: handle platforms where time.Timer.start() fails
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var spin = Backoff.init();
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var timer = if (timeout == null) null else time.Timer.start() catch unreachable;
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while (@atomicLoad(State, &self.state, .Monotonic) == .Waiting) {
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while (@atomicLoad(u32, ptr, .Acquire) == expected) {
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spin.yield();
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if (timeout) |timeout_ns| {
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if (timer.?.read() > timeout_ns)
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return ResetEvent.WaitError.TimedOut;
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}
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}
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return true;
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}
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};
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});
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const LinuxEvent = struct {
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state: State,
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const State = EventState(i32);
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pub fn init() LinuxEvent {
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return LinuxEvent{ .state = .Empty };
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}
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pub fn deinit(self: *LinuxEvent) void {
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self.* = undefined;
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}
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pub fn isSet(self: *const LinuxEvent) bool {
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return @atomicLoad(State, &self.state, .Acquire) == .Signaled;
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}
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pub fn set(self: *LinuxEvent) bool {
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if (@atomicRmw(State, &self.state, .Xchg, .Signaled, .Release) != .Waiting)
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return false;
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const rc = linux.futex_wake(@ptrCast(*const i32, &self.state), linux.FUTEX_WAKE | linux.FUTEX_PRIVATE_FLAG, 1);
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const LinuxEvent = AtomicEvent(struct {
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fn wake(ptr: *const u32) void {
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const key = @ptrCast(*const i32, ptr);
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const rc = linux.futex_wake(key, linux.FUTEX_WAKE | linux.FUTEX_PRIVATE_FLAG, 1);
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assert(linux.getErrno(rc) == 0);
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return true;
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}
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pub fn reset(self: *LinuxEvent) bool {
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return @atomicRmw(State, &self.state, .Xchg, .Empty, .Monotonic) == .Signaled;
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}
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pub fn wait(self: *LinuxEvent, timeout: ?u64) ResetEvent.WaitError!bool {
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var state = @atomicLoad(State, &self.state, .Monotonic);
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while (true) {
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switch (state) {
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.Empty => state = @cmpxchgWeak(State, &self.state, .Empty, .Waiting, .Acquire, .Monotonic) orelse break,
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.Waiting => break,
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.Signaled => return false,
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}
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}
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fn wait(ptr: *const u32, expected: u32, timeout: ?u64) ResetEvent.WaitError!void {
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var ts: linux.timespec = undefined;
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var ts_ptr: ?*linux.timespec = null;
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if (timeout) |timeout_ns| {
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@ -204,28 +190,94 @@ const LinuxEvent = struct {
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ts.tv_nsec = @intCast(isize, timeout_ns % time.ns_per_s);
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}
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while (@atomicLoad(State, &self.state, .Monotonic) == .Waiting) {
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const rc = linux.futex_wait(@ptrCast(*const i32, &self.state), linux.FUTEX_WAIT | linux.FUTEX_PRIVATE_FLAG, @enumToInt(State.Waiting), ts_ptr);
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const key = @ptrCast(*const i32, ptr);
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const key_expect = @bitCast(i32, expected);
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while (@atomicLoad(i32, key, .Acquire) == key_expect) {
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const rc = linux.futex_wait(key, linux.FUTEX_WAIT | linux.FUTEX_PRIVATE_FLAG, key_expect, ts_ptr);
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switch (linux.getErrno(rc)) {
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0, linux.EINTR => continue,
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linux.EAGAIN => break,
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0, linux.EAGAIN => break,
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linux.EINTR => continue,
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linux.ETIMEDOUT => return ResetEvent.WaitError.TimedOut,
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else => unreachable,
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}
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}
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}
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};
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});
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const WindowsEvent = AtomicEvent(struct {
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fn wake(ptr: *const u32) void {
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if (getEventHandle()) |handle| {
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const key = @ptrCast(*const c_void, ptr);
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const rc = windows.ntdll.NtReleaseKeyedEvent(handle, key, windows.FALSE, null);
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assert(rc == 0);
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}
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}
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fn wait(ptr: *const u32, expected: u32, timeout: ?u64) ResetEvent.WaitError!void {
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// fallback to spinlock if NT Keyed Events arent available
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const handle = getEventHandle() orelse {
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return SpinEvent.Futex.wait(ptr, expected, timeout);
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};
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var timeout_ptr: ?*windows.LARGE_INTEGER = null;
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var timeout_value: windows.LARGE_INTEGER = undefined;
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if (timeout) |timeout_ns| {
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timeout_ptr = &timeout_value;
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timeout_value = @intCast(windows.LARGE_INTEGER, @divFloor(timeout_ns, time.millisecond));
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}
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const key = @ptrCast(*const c_void, ptr);
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while (@atomicLoad(u32, ptr, .Acquire) == expected) {
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const rc = windows.ntdll.NtWaitForKeyedEvent(handle, key, windows.FALSE, timeout_ptr);
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assert(rc == 0);
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}
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}
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var keyed_state = State.Uninitialized;
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var keyed_handle: ?windows.HANDLE = null;
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const State = enum(u8) {
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Uninitialized,
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Intializing,
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Initialized,
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};
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fn getEventHandle() ?windows.HANDLE {
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var spin = Backoff.init();
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var state = @atomicLoad(State, &keyed_state, .Monotonic);
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while (true) {
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switch (state) {
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.Initialized => {
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return keyed_handle;
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},
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.Intializing => {
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spin.yield();
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state = @atomicLoad(State, &keyed_state, .Acquire);
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},
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.Uninitialized => state = @cmpxchgWeak(State, &keyed_state, state, .Intializing, .Acquire, .Monotonic) orelse {
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var handle: windows.HANDLE = undefined;
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const access_mask = windows.GENERIC_READ | windows.GENERIC_WRITE;
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if (windows.ntdll.NtCreateKeyedEvent(&handle, access_mask, null, 0) == 0)
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keyed_handle = handle;
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@atomicStore(State, &keyed_state, .Initialized, .Release);
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return keyed_handle;
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},
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}
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}
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}
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});
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const PosixEvent = struct {
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state: State,
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state: u32,
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cond: c.pthread_cond_t,
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mutex: c.pthread_mutex_t,
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const State = EventState(u8);
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const IS_SET: u32 = 1;
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pub fn init() PosixEvent {
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return PosixEvent{
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.state = .Empty,
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.state = .0,
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.cond = c.PTHREAD_COND_INITIALIZER,
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.mutex = c.PTHREAD_MUTEX_INITIALIZER,
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};
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@ -234,107 +286,141 @@ const PosixEvent = struct {
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pub fn deinit(self: *PosixEvent) void {
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// On dragonfly, the destroy functions return EINVAL if they were initialized statically.
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const retm = c.pthread_mutex_destroy(&self.mutex);
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assert(retm == 0 or retm == (if (builtin.os == .dragonfly) std.os.EINVAL else 0));
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assert(retm == 0 or retm == (if (builtin.os == .dragonfly) os.EINVAL else 0));
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const retc = c.pthread_cond_destroy(&self.cond);
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assert(retc == 0 or retc == (if (builtin.os == .dragonfly) std.os.EINVAL else 0));
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self.* = undefined;
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assert(retc == 0 or retc == (if (builtin.os == .dragonfly) os.EINVAL else 0));
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}
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pub fn isSet(self: *const PosixEvent) bool {
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pub fn isSet(self: *PosixEvent) bool {
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assert(c.pthread_mutex_lock(&self.mutex) == 0);
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defer assert(c.pthread_mutex_unlock(&self.mutex) == 0);
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return self.state == .Signaled;
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}
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pub fn set(self: *PosixEvent) bool {
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assert(c.pthread_mutex_lock(&self.mutex) == 0);
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defer assert(c.pthread_mutex_unlock(&self.mutex) == 0);
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const woken = self.state == .Waiting;
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self.state = .Signaled;
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return woken;
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return self.state == IS_SET;
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}
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pub fn reset(self: *PosixEvent) bool {
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assert(c.pthread_mutex_lock(&self.mutex) == 0);
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defer assert(c.pthread_mutex_unlock(&self.mutex) == 0);
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const was_set = self.state == .Signaled;
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self.state = .Empty;
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const was_set = self.state == IS_SET;
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self.state = 0;
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return was_set;
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}
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pub fn set(self: *PosixEvent, auto_reset: bool) bool {
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assert(c.pthread_mutex_lock(&self.mutex) == 0);
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defer assert(c.pthread_mutex_unlock(&self.mutex) == 0);
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const had_waiter = self.state > IS_SET;
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self.state = if (auto_reset) 0 else IS_SET;
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if (had_waiter) {
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assert(c.pthread_cond_signal(&self.cond) == 0);
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}
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return had_waiter;
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}
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pub fn wait(self: *PosixEvent, timeout: ?u64) ResetEvent.WaitError!bool {
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assert(c.pthread_mutex_lock(&self.mutex) == 0);
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defer assert(c.pthread_mutex_unlock(&self.mutex) == 0);
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if (self.state == .Signaled)
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if (self.state == IS_SET)
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return false;
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var ts: std.os.timespec = undefined;
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var ts: os.timespec = undefined;
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var ts_ptr = &ts;
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if (timeout) |timeout_ns| {
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var tv: std.os.timeval = undefined;
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var tv: os.timeval = undefined;
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assert(c.gettimeofday(&tv, null) == 0);
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ts.tv_sec = @intCast(isize, tv.tv_sec + (timeout_ns / time.ns_per_s));
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ts.tv_nsec = @intCast(isize, (tv.tv_usec * time.microsecond) + (timeout_ns % time.ns_per_s));
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ts.tv_sec = tv.tv_sec + @intCast(isize, timeout_ns / time.ns_per_s);
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ts.tv_nsec = (tv.tv_usec * time.microsecond) + @intCast(isize, timeout_ns % time.ns_per_s);
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}
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self.state = .Waiting;
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while (self.state == .Waiting) {
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var dummy_value: u32 = undefined;
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var wait_token = @truncate(u32, @ptrToInt(&dummy_value));
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self.state = wait_token;
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while (self.state == wait_token) {
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const rc = switch (timeout == null) {
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true => c.pthread_cond_wait(&self.cond, &self.mutex),
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else => c.pthread_cond_timedwait(&self.cond, &self.mutex, ts_ptr),
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};
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assert(rc == 0);
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}
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}
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};
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const WindowsEvent = struct {
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state: State,
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const State = EventState(u32);
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pub fn init() WindowsEvent {
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return WindowsEvent{ .state = .Empty };
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}
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pub fn deinit(self: *WindowsEvent) void {
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self.* = undefined;
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}
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pub fn isSet(self: *const WindowsEvent) bool {
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return @atomicLoad(State, &self.state, .Acquire) == .Signaled;
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}
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pub fn set(self: *WindowsEvent) bool {
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if (@atomicRmw(State, &self.state, .Xchg, .Signaled, .Release) != .Waiting)
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return false;
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||||
|
||||
if (getEventHandle()) |handle| {
|
||||
const key = @ptrCast(*const c_void, &self.state);
|
||||
const rc = windows.ntdll.NtReleaseKeyedEvent(handle, key, windows.FALSE, null);
|
||||
assert(rc == 0);
|
||||
// TODO: rc appears to be the positive error code making os.errno() always return 0 on linux
|
||||
switch (std.math.max(@as(c_int, os.errno(rc)), rc)) {
|
||||
0 => {},
|
||||
os.ETIMEDOUT => return ResetEvent.WaitError.TimedOut,
|
||||
os.EINVAL => unreachable,
|
||||
os.EPERM => unreachable,
|
||||
else => unreachable,
|
||||
}
|
||||
}
|
||||
return true;
|
||||
}
|
||||
};
|
||||
|
||||
pub fn reset(self: *WindowsEvent) bool {
|
||||
return @atomicRmw(State, &self.state, .Xchg, .Empty, .Monotonic) == .Signaled;
|
||||
}
|
||||
test "std.ResetEvent" {
|
||||
// TODO
|
||||
if (builtin.single_threaded)
|
||||
return error.SkipZigTest;
|
||||
|
||||
pub fn wait(self: *WindowsEvent, timeout: ?u64) ResetEvent.WaitError!bool {
|
||||
var state = @atomicLoad(State, &self.state, .Monotonic);
|
||||
while (true) {
|
||||
switch (state) {
|
||||
.Empty => state = @cmpxchgWeak(State, &self.state, .Empty, .Waiting, .Acquire, .Monotonic) orelse break,
|
||||
.Waiting => break,
|
||||
.Signaled => return false,
|
||||
}
|
||||
var event = ResetEvent.init();
|
||||
defer event.deinit();
|
||||
|
||||
// test event setting
|
||||
testing.expect(event.isSet() == false);
|
||||
testing.expect(event.set(false) == false);
|
||||
testing.expect(event.isSet() == true);
|
||||
|
||||
// test event resetting
|
||||
testing.expect(event.reset() == true);
|
||||
testing.expect(event.isSet() == false);
|
||||
testing.expect(event.reset() == false);
|
||||
|
||||
// test waiting timeout
|
||||
const delay = 100 * time.millisecond;
|
||||
var timer = time.Timer.start() catch unreachable;
|
||||
testing.expectError(ResetEvent.WaitError.TimedOut, event.wait(delay));
|
||||
const elapsed = timer.read();
|
||||
testing.expect(elapsed >= delay and elapsed < delay * 2);
|
||||
|
||||
// test cross thread signaling
|
||||
const Context = struct {
|
||||
event: ResetEvent,
|
||||
value: u128,
|
||||
|
||||
fn receiver(self: *@This()) void {
|
||||
// wait for the sender to notify us with updated value
|
||||
assert(self.value == 0);
|
||||
assert((self.event.wait(1 * time.second) catch unreachable) == true);
|
||||
assert(self.value == 1);
|
||||
|
||||
// wait for sender to sleep, then notify it of new value
|
||||
time.sleep(50 * time.millisecond);
|
||||
self.value = 2;
|
||||
assert(self.event.set(false) == true);
|
||||
}
|
||||
|
||||
const timeout_ms = if (timeout @intCast(windows.LARGE_INTEGER, )
|
||||
}
|
||||
};
|
||||
fn sender(self: *@This()) !void {
|
||||
// wait for the receiver() to start wait()'ing
|
||||
time.sleep(50 * time.millisecond);
|
||||
|
||||
// update value to 1 and notify the receiver()
|
||||
assert(self.value == 0);
|
||||
self.value = 1;
|
||||
assert(self.event.set(true) == true);
|
||||
|
||||
// wait for the receiver to update the value & notify us
|
||||
assert((try self.event.wait(1 * time.second)) == true);
|
||||
assert(self.value == 2);
|
||||
}
|
||||
};
|
||||
|
||||
_ = event.reset();
|
||||
var context = Context{
|
||||
.event = event,
|
||||
.value = 0,
|
||||
};
|
||||
|
||||
var receiver = try std.Thread.spawn(&context, Context.receiver);
|
||||
defer receiver.wait();
|
||||
try context.sender();
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user