levsync/levsync.odin

@@ -124,6 +124,14 @@ spinlock_unlock :: #force_inline proc "contextless" (lock: ^Spinlock) {
 	intrinsics.atomic_store_explicit(lock, false, .Release)
 }
 
+try_lock :: proc {
+	spinlock_try_lock,
+}
+
+unlock :: proc {
+	spinlock_unlock,
+}
+
 // ---------------------------------------------------------------------------------------------------------------------
 // ----- Tests ------------------------
 // ---------------------------------------------------------------------------------------------------------------------

phased_executor/phased_executor.odin

@@ -10,17 +10,19 @@ import "core:sync"
 import "core:thread"
 
 import b "../basic"
+import "../levsync"
 
 DEFT_BATCH_SIZE :: 1024 // Number of nodes in each batch
 DEFT_SPIN_LIMIT :: 2_500_000
 
 Harness :: struct($T: typeid) where intrinsics.type_has_nil(T) {
-	mutex:        sync.Mutex,
+	mutex:      sync.Mutex,
-	condition:    sync.Cond,
+	condition:  sync.Cond,
-	cmd_queue:    q.Queue(T),
+	cmd_queue:  q.Queue(T),
-	spin, locked: bool,
+	spin:       bool,
-	_pad:         [64 - size_of(uint)]u8, // We want join_count to have its own cache line
+	lock:       levsync.Spinlock,
-	join_count:   uint, // Number of commands completed since last exec_join
+	_pad:       [64 - size_of(uint)]u8, // We want join_count to have its own cache line
+	join_count: uint, // Number of commands completed since last exec_join
 }
 
 // `nil` for type `T` is reserved for executor shutdown. If you need `nil` for something else wrap `T`
@@ -87,14 +89,14 @@ destroy_executor :: proc(executor: ^Executor($T), allocator := context.allocator
 	// Exit thread loops
 	for &harness in executor.harnesses {
 		for {
-			if try_lock_harness(&harness.locked) {
+			if levsync.try_lock(&harness.lock) {
 				q.push_back(&harness.cmd_queue, nil)
 				if !harness.spin {
 					sync.mutex_lock(&harness.mutex)
 					sync.cond_signal(&harness.condition)
 					sync.mutex_unlock(&harness.mutex)
 				}
-				intrinsics.atomic_store_explicit(&harness.locked, false, .Release)
+				levsync.unlock(&harness.lock)
 				break
 			}
 		}
@@ -108,18 +110,6 @@ destroy_executor :: proc(executor: ^Executor($T), allocator := context.allocator
 	delete(executor.harnesses, allocator)
 }
 
-// Returns true if lock successfuly acquired, false otherwise
-try_lock_harness :: #force_inline proc "contextless" (locked: ^bool) -> bool {
-	was_locked, lock_acquired := intrinsics.atomic_compare_exchange_weak_explicit(
-		locked,
-		false,
-		true,
-		.Acq_Rel,
-		.Relaxed,
-	)
-	return lock_acquired
-}
-
 build_task :: proc(
 	$on_command_received: proc(command: $T),
 ) -> (
@@ -140,12 +130,12 @@ build_task :: proc(
 			// Spinning
 			spin_count: uint = 0
 			spin_loop: for {
-				if try_lock_harness(&harness.locked) {
+				if levsync.try_lock(&harness.lock) {
 					if q.len(harness.cmd_queue) > 0 {
 
 						// Execute command
 						command := q.pop_front(&harness.cmd_queue)
-						intrinsics.atomic_store_explicit(&harness.locked, false, .Release)
+						levsync.unlock(&harness.lock)
 						if command == nil do return
 						on_command_received(command)
 
@@ -153,7 +143,7 @@ build_task :: proc(
 						intrinsics.atomic_add_explicit(&harness.join_count, 1, .Release)
 					} else {
 						defer intrinsics.cpu_relax()
-						defer intrinsics.atomic_store_explicit(&harness.locked, false, .Release)
+						defer levsync.unlock(&harness.lock)
 						spin_count += 1
 						if spin_count == executor.spin_limit {
 							harness.spin = false
@@ -171,8 +161,8 @@ build_task :: proc(
 				sync.cond_wait(&harness.condition, &harness.mutex)
 				for { 	// Loop to acquire harness lock
 					defer intrinsics.cpu_relax()
-					if try_lock_harness(&harness.locked) {
+					if levsync.try_lock(&harness.lock) {
-						defer intrinsics.atomic_store_explicit(&harness.locked, false, .Release)
+						defer levsync.unlock(&harness.lock)
 						if q.len(harness.cmd_queue) > 0 {
 							harness.spin = true
 							break cond_loop
@@ -199,13 +189,13 @@ exec_command :: proc(executor: ^Executor($T), command: T) {
 			}
 		}
 		harness := &executor.harnesses[executor.harness_index]
-		if try_lock_harness(&harness.locked) {
+		if levsync.try_lock(&harness.lock) {
 			if q.len(harness.cmd_queue) <= executor.cmd_queue_floor {
 				q.push_back(&harness.cmd_queue, command)
 				executor.cmd_queue_floor = q.len(harness.cmd_queue)
 				slave_sleeping := !harness.spin
 				// Must release lock before signalling to avoid race from slave spurious wakeup
-				intrinsics.atomic_store_explicit(&harness.locked, false, .Release)
+				levsync.unlock(&harness.lock)
 				if slave_sleeping {
 					sync.mutex_lock(&harness.mutex)
 					sync.cond_signal(&harness.condition)
@@ -213,7 +203,7 @@ exec_command :: proc(executor: ^Executor($T), command: T) {
 				}
 				break
 			}
-			intrinsics.atomic_store_explicit(&harness.locked, false, .Release)
+			levsync.unlock(&harness.lock)
 		}
 	}
 }