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authorRoland McGrath <roland@hack.frob.com>2015-05-26 15:30:47 -0700
committerRoland McGrath <roland@hack.frob.com>2015-05-26 15:30:47 -0700
commit1f3a37b19ccc481197ffd6a5cf014dfb07c6dd4e (patch)
tree30b364d6ad1d27bd131d3bb9e7194c6e85d16e03 /sysdeps/nacl
parent68c97aef626e489effeffe6d1d6a4f14656a720c (diff)
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NaCl: Add NaCl-specific __lll_timedlock_wait.
Diffstat (limited to 'sysdeps/nacl')
-rw-r--r--sysdeps/nacl/lll_timedlock_wait.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/sysdeps/nacl/lll_timedlock_wait.c b/sysdeps/nacl/lll_timedlock_wait.c
new file mode 100644
index 0000000..df951ee
--- /dev/null
+++ b/sysdeps/nacl/lll_timedlock_wait.c
@@ -0,0 +1,52 @@
+/* Timed low level locking for pthread library. NaCl version.
+ Copyright (C) 2015 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <assert.h>
+#include <atomic.h>
+#include <errno.h>
+#include <lowlevellock.h>
+#include <sys/time.h>
+
+
+/* This behaves the same as the generic version in nptl/. It's simpler
+ because it doesn't need to convert an absolute timeout to a relative
+ one (and back again in the lll_futex_timed_wait macro). */
+
+int
+__lll_timedlock_wait (int *futex, const struct timespec *abstime, int private)
+{
+ /* Reject invalid timeouts. */
+ if (__glibc_unlikely (abstime->tv_nsec < 0)
+ || __glibc_unlikely (abstime->tv_nsec >= 1000000000))
+ return EINVAL;
+
+ /* Try locking. */
+ int result = 0;
+ while (atomic_exchange_acq (futex, 2) != 0)
+ {
+ /* If *futex == 2, wait until woken or timeout. */
+ result = __nacl_irt_futex.futex_wait_abs ((volatile int *) futex, 2,
+ abstime);
+ if (__glibc_likely (result == 0)
+ || __glibc_likely (result == ETIMEDOUT))
+ break;
+ assert (result == EAGAIN);
+ }
+
+ return result;
+}