From 7b34cb7741c683dc623ece652032f1bf09d34140 Mon Sep 17 00:00:00 2001
From: "Luke T. Shumaker" <lukeshu@lukeshu.com>
Date: Sun, 29 Sep 2024 10:56:18 -0600
Subject: wip fixes

---
 libcr_ipc/sema.c | 81 --------------------------------------------------------
 1 file changed, 81 deletions(-)
 delete mode 100644 libcr_ipc/sema.c

(limited to 'libcr_ipc/sema.c')

diff --git a/libcr_ipc/sema.c b/libcr_ipc/sema.c
deleted file mode 100644
index a3efb57..0000000
--- a/libcr_ipc/sema.c
+++ /dev/null
@@ -1,81 +0,0 @@
-/* libcr_ipc/sema.c - Simple semaphores for libcr (implementation file)
- *
- * Copyright (C) 2024  Luke T. Shumaker <lukeshu@lukeshu.com>
- * SPDX-Licence-Identifier: AGPL-3.0-or-later
- */
-
-#include <assert.h>
-
-#include <libcr_ipc/sema.h>
-
-/** Drain the sema->{head,tail} list.  Returns true if cr_getcid() was drained.  */
-static inline bool drain(cr_sema_t *sema) {
-	assert(!sema->locked);
-	cid_t self = cr_getcid();
-
-	enum drain_result {
-		DRAINING,
-		DRAINED_SELF, /* stopped because drained `self` */
-		DRAINED_ALL,  /* stopped because sema->head == NULL */
-		DRAINED_SOME, /* stopped because sema->cnt == 0 */
-	} state = DRAINING;
-	do { 
-		sema->locked = true;
-		while (state == DRAINING) {
-			if (!sema->head) {
-				state = DRAINED_ALL;
-			} else if (!sema->cnt) {
-				state = DRAINED_SOME;
-			} else {
-				sema->cnt--;
-				cid_t cid = sema->head->val;
-				if (cid == self)
-					state = DRAINED_SELF;
-				else
-					cr_unpause(sema->head->val);
-				sema->head = sema->head->next;
-				if (!sema->head)
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wdiscarded-qualifiers"
-					sema->tail = &sema->head;
-#pragma GCC diagnostic pop
-			}
-		}
-		sema->locked = false;
-		/* If there are still coroutines in sema->head, check
-		 * that sema->cnt wasn't incremented between `if
-		 * (!sema->cnt)` and `sema->locked = false`.  */
-	} while (state == DRAINED_SOME && sema->cnt);
-	/* If state == DRAINED_SELF, then we better have been the last
-	 * item in the list!  */
-	assert(state != DRAINED_SELF || !sema->head);
-	return state == DRAINED_SELF;
-}
-
-void cr_sema_signal(cr_sema_t *sema) {
-	sema->cnt++;
-	if (!sema->locked)
-		drain(sema);
-}
-
-void cr_sema_wait(cr_sema_t *sema) {
-	struct _cr_ipc_cid_list self = {
-		.val = cr_getcid(),
-		.next = NULL,
-	};
-
-	sema->locked = true;
-	if (!sema->tail)
-		sema->head = &self;
-	else
-		*(sema->tail) = &self;
-	sema->tail = &(self.next);
-	sema->locked = false;
-
-	if (drain(sema))
-		/* DRAINED_SELF: (1) No need to pause+yield, (2) we
-		 * better have been the last item in the list!  */
-		assert(!self.next);
-	else
-		cr_pause_and_yield();
-}
-- 
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