libcr_ipc: Delete owned_mutex

2 files changed, 0 insertions, 80 deletions

diff --git a/libcr_ipc/CMakeLists.txt b/libcr_ipc/CMakeLists.txt
index ae515bc..2b13e37 100644
--- a/libcr_ipc/CMakeLists.txt
+++ b/libcr_ipc/CMakeLists.txt
@@ -17,7 +17,6 @@ set(ipc_tests
 	chan
 	#select
 	mutex
-	#owned_mutex
 	rpc
 	sema
 )
diff --git a/libcr_ipc/include/libcr_ipc/owned_mutex.h b/libcr_ipc/include/libcr_ipc/owned_mutex.h
deleted file mode 100644
index c66240f..0000000
--- a/libcr_ipc/include/libcr_ipc/owned_mutex.h
+++ /dev/null
@@ -1,79 +0,0 @@
-/* libcr_ipc/owned_mutex.h - Owned mutexes for libcr
- *
- * Copyright (C) 2024  Luke T. Shumaker <lukeshu@lukeshu.com>
- * SPDX-License-Identifier: AGPL-3.0-or-later
- */
-
-#ifndef _LIBCR_IPC_OWNED_MUTEX_H_
-#define _LIBCR_IPC_OWNED_MUTEX_H_
-
-#include <stdbool.h> /* for bool */
-
-#include <libcr/coroutine.h> /* for cid_t, cr_unpause(), cr_pause_and_yield() */
-
-#include <libcr_ipc/_linkedlist.h>
-
-struct _cr_owned_mutex_waiter {
-	_cr_ipc_sll_node;
-	cid_t                    cid;
-};
-
-/**
- * A cr_owned_mutex_t is a fair mutex that tracks not just whether it
- * is locked, but which coroutine has it locked.
- *
- * None of the methods have `_from_intrhandler` variants because (1)
- * an interrupt handler can't block, so it shouldn't ever lock a mutex
- * because that can block; and (2) if it can't lock a mutex in the
- * first place, then it has no business unlocking one.
- */
-typedef struct {
-	cid_t                   owner;
-	_cr_ipc_sll_root        waiters;
-} cr_owned_mutex_t;
-
-/**
- * Lock the mutex.  Blocks if it is already locked.
- *
- * @runs_in coroutine
- * @cr_pauses maybe
- * @cr_yields maybe
- */
-static inline void cr_owned_mutex_lock(cr_owned_mutex_t *mu) {
-	assert(mu);
-
-	if (!mu->owner) /* non-blocking fast-path */
-		mu->owner = cr_getcid();
-	else { /* blocking slow-path */
-		struct _cr_owned_mutex_waiter self = {
-			.cid     = cr_getcid(),
-		};
-		_cr_ipc_sll_push_to_rear(&mu->waiters, &self);
-		cr_pause_and_yield();
-	}
-	assert(mu->owner == cr_getcid());
-}
-
-/**
- * Unlock the mutex.  Unblocks a coroutine that is blocked on
- * cr_owned_mutex_lock().  Must be the called from the same coroutine
- * that called cr_owned_mutex_lock().
- *
- * @runs_in coroutine
- * @cr_pauses never
- * @cr_yields never
- */
-static inline void cr_owned_mutex_unlock(cr_owned_mutex_t *mu) {
-	assert(mu);
-
-	assert(mu->owner == cr_getcid());
-	if (mu->waiters.front) {
-		cid_t waiter = _cr_ipc_sll_node_cast(struct _cr_owned_mutex_waiter, mu->waiters.front)->cid;
-		cr_unpause(waiter);
-		mu->owner = waiter;
-		_cr_ipc_sll_pop_from_front(&mu->waiters);
-	} else
-		mu->owner = 0;
-}
-
-#endif /* _LIBCR_IPC_OWNED_MUTEX_H_ */