From 919bc52171f32bfe264b987934e1055b6901ac6d Mon Sep 17 00:00:00 2001
From: deischen <deischen@FreeBSD.org>
Date: Wed, 3 Sep 2003 17:56:26 +0000
Subject: Don't assume sizeof(long) = sizeof(int) on x86; use int instead of
 long types for low-level locks.

Add prototypes for some internal libc functions that are
wrapped by the library as cancellation points.

Add memory barriers to alpha atomic swap functions (submitted
by davidxu).

Requested by:	bde
---
 lib/libpthread/sys/lock.c | 22 +++++++++++-----------
 lib/libpthread/sys/lock.h |  2 +-
 2 files changed, 12 insertions(+), 12 deletions(-)

(limited to 'lib/libpthread/sys')

diff --git a/lib/libpthread/sys/lock.c b/lib/libpthread/sys/lock.c
index c67da33..9cae036 100644
--- a/lib/libpthread/sys/lock.c
+++ b/lib/libpthread/sys/lock.c
@@ -107,7 +107,7 @@ void
 _lock_acquire(struct lock *lck, struct lockuser *lu, int prio)
 {
 	int i;
-	long lval;
+	int lval;
 
 	/**
 	 * XXX - We probably want to remove these checks to optimize
@@ -167,7 +167,7 @@ _lock_acquire(struct lock *lck, struct lockuser *lu, int prio)
 				if (lu->lu_watchreq->lr_active == 0)
 					break;
 			}
-			atomic_swap_long((long *)&lu->lu_watchreq->lr_locked,
+			atomic_swap_int((int *)&lu->lu_watchreq->lr_locked,
 			    2, &lval);
 			if (lval == 0)
 				lu->lu_watchreq->lr_locked = 0;
@@ -188,7 +188,7 @@ _lock_release(struct lock *lck, struct lockuser *lu)
 	struct lockuser *lu_tmp, *lu_h;
 	struct lockreq *myreq;
 	int prio_h;
-	long lval;
+	int lval;
 
 	/**
 	 * XXX - We probably want to remove these checks to optimize
@@ -240,8 +240,8 @@ _lock_release(struct lock *lck, struct lockuser *lu)
 		if (lu_h != NULL) {
 			/* Give the lock to the highest priority user. */
 			if (lck->l_wakeup != NULL) {
-				atomic_swap_long(
-				    (long *)&lu_h->lu_watchreq->lr_locked,
+				atomic_swap_int(
+				    (int *)&lu_h->lu_watchreq->lr_locked,
 				    0, &lval);
 				if (lval == 2)
 					/* Notify the sleeper */
@@ -249,11 +249,11 @@ _lock_release(struct lock *lck, struct lockuser *lu)
 					    lu_h->lu_myreq->lr_watcher);
 			}
 			else
-				atomic_store_rel_long(
+				atomic_store_rel_int(
 				    &lu_h->lu_watchreq->lr_locked, 0);
 		} else {
 			if (lck->l_wakeup != NULL) {
-				atomic_swap_long((long *)&myreq->lr_locked,
+				atomic_swap_int((int *)&myreq->lr_locked,
 				    0, &lval);
 				if (lval == 2)
 					/* Notify the sleeper */
@@ -261,7 +261,7 @@ _lock_release(struct lock *lck, struct lockuser *lu)
 			}
 			else
 				/* Give the lock to the previous request. */
-				atomic_store_rel_long(&myreq->lr_locked, 0);
+				atomic_store_rel_int(&myreq->lr_locked, 0);
 		}
 	} else {
 		/*
@@ -274,14 +274,14 @@ _lock_release(struct lock *lck, struct lockuser *lu)
 		lu->lu_watchreq = NULL;
 		lu->lu_myreq->lr_locked = 1;
 		if (lck->l_wakeup) {
-			atomic_swap_long((long *)&myreq->lr_locked, 0, &lval);
+			atomic_swap_int((int *)&myreq->lr_locked, 0, &lval);
 			if (lval == 2)
 				/* Notify the sleeper */
 				lck->l_wakeup(lck, myreq->lr_watcher);
 		}
 		else
 			/* Give the lock to the previous request. */
-			atomic_store_rel_long(&myreq->lr_locked, 0);
+			atomic_store_rel_int(&myreq->lr_locked, 0);
 	}
 	lu->lu_myreq->lr_active = 0;
 }
@@ -289,7 +289,7 @@ _lock_release(struct lock *lck, struct lockuser *lu)
 void
 _lock_grant(struct lock *lck /* unused */, struct lockuser *lu)
 {
-	atomic_store_rel_long(&lu->lu_watchreq->lr_locked, 3);
+	atomic_store_rel_int(&lu->lu_watchreq->lr_locked, 3);
 }
 
 void
diff --git a/lib/libpthread/sys/lock.h b/lib/libpthread/sys/lock.h
index 9d4b994..917ca63 100644
--- a/lib/libpthread/sys/lock.h
+++ b/lib/libpthread/sys/lock.h
@@ -51,9 +51,9 @@ struct lock {
 
 /* Try to make this >= CACHELINESIZE */
 struct lockreq {
-	volatile long	lr_locked;	/* lock granted = 0, busy otherwise */
 	struct lockuser	*lr_watcher;	/* only used for priority locks */
 	struct lockuser	*lr_owner;	/* only used for priority locks */
+	volatile int	lr_locked;	/* lock granted = 0, busy otherwise */
 	volatile int	lr_active;	/* non-zero if the lock is last lock for thread */
 };
 
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