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authorAustin Foxley <austinf@cetoncorp.com>2009-10-17 19:26:24 (GMT)
committerAustin Foxley <austinf@cetoncorp.com>2009-10-17 19:26:24 (GMT)
commitc68d0fa2d88fc2134a38d99e7e944828384a7671 (patch)
tree6596943bd1c77f18d6e49d4153ddd3f3d67b49f5 /libpthread/nptl/sysdeps/unix/sysv/linux/sh/lowlevellock.h
parent9a03e98a3b418f33c347a6023e9320f3a42cb9e4 (diff)
libpthread/nptl: core of the "Native Posix Threading Library" for uClibc
targetting arm,sh,i386,mips,sparc for now Signed-off-by: Austin Foxley <austinf@cetoncorp.com>
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/sh/lowlevellock.h')
-rw-r--r--libpthread/nptl/sysdeps/unix/sysv/linux/sh/lowlevellock.h294
1 files changed, 294 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/sh/lowlevellock.h b/libpthread/nptl/sysdeps/unix/sysv/linux/sh/lowlevellock.h
new file mode 100644
index 0000000..45339f5
--- /dev/null
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/sh/lowlevellock.h
@@ -0,0 +1,294 @@
+/* Copyright (C) 2003, 2004 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#ifndef _LOWLEVELLOCK_H
+#define _LOWLEVELLOCK_H 1
+
+#include <syscall.h>
+#include <time.h>
+#include <sys/param.h>
+#include <bits/pthreadtypes.h>
+
+#define FUTEX_WAIT 0
+#define FUTEX_WAKE 1
+
+
+/* Initializer for compatibility lock. */
+#define LLL_MUTEX_LOCK_INITIALIZER (0)
+#define LLL_MUTEX_LOCK_INITIALIZER_LOCKED (1)
+#define LLL_MUTEX_LOCK_INITIALIZER_WAITERS (2)
+
+extern int __lll_mutex_lock_wait (int val, int *__futex) attribute_hidden;
+extern int __lll_mutex_timedlock_wait (int val, int *__futex,
+ const struct timespec *abstime)
+ attribute_hidden;
+extern int __lll_mutex_unlock_wake (int *__futex) attribute_hidden;
+
+
+#define lll_mutex_trylock(futex) \
+ ({ unsigned char __result; \
+ __asm __volatile ("\
+ .align 2\n\
+ mova 1f,r0\n\
+ nop\n\
+ mov r15,r1\n\
+ mov #-8,r15\n\
+ 0: mov.l @%1,r2\n\
+ cmp/eq r2,%3\n\
+ bf 1f\n\
+ mov.l %2,@%1\n\
+ 1: mov r1,r15\n\
+ mov #-1,%0\n\
+ negc %0,%0"\
+ : "=r" (__result) \
+ : "r" (&(futex)), \
+ "r" (LLL_MUTEX_LOCK_INITIALIZER_LOCKED), \
+ "r" (LLL_MUTEX_LOCK_INITIALIZER) \
+ : "r0", "r1", "r2", "t", "memory"); \
+ __result; })
+
+#define lll_mutex_cond_trylock(futex) \
+ ({ unsigned char __result; \
+ __asm __volatile ("\
+ .align 2\n\
+ mova 1f,r0\n\
+ nop\n\
+ mov r15,r1\n\
+ mov #-8,r15\n\
+ 0: mov.l @%1,r2\n\
+ cmp/eq r2,%3\n\
+ bf 1f\n\
+ mov.l %2,@%1\n\
+ 1: mov r1,r15\n\
+ mov #-1,%0\n\
+ negc %0,%0"\
+ : "=r" (__result) \
+ : "r" (&(futex)), \
+ "r" (LLL_MUTEX_LOCK_INITIALIZER_WAITERS), \
+ "r" (LLL_MUTEX_LOCK_INITIALIZER) \
+ : "r0", "r1", "r2", "t", "memory"); \
+ __result; })
+
+#define lll_mutex_lock(futex) \
+ (void) ({ int __result, *__futex = &(futex); \
+ __asm __volatile ("\
+ .align 2\n\
+ mova 1f,r0\n\
+ nop\n\
+ mov r15,r1\n\
+ mov #-8,r15\n\
+ 0: mov.l @%2,%0\n\
+ tst %0,%0\n\
+ bf 1f\n\
+ mov.l %1,@%2\n\
+ 1: mov r1,r15"\
+ : "=&r" (__result) : "r" (1), "r" (__futex) \
+ : "r0", "r1", "t", "memory"); \
+ if (__result) \
+ __lll_mutex_lock_wait (__result, __futex); })
+
+/* Special version of lll_mutex_lock which causes the unlock function to
+ always wakeup waiters. */
+#define lll_mutex_cond_lock(futex) \
+ (void) ({ int __result, *__futex = &(futex); \
+ __asm __volatile ("\
+ .align 2\n\
+ mova 1f,r0\n\
+ nop\n\
+ mov r15,r1\n\
+ mov #-8,r15\n\
+ 0: mov.l @%2,%0\n\
+ tst %0,%0\n\
+ bf 1f\n\
+ mov.l %1,@%2\n\
+ 1: mov r1,r15"\
+ : "=&r" (__result) : "r" (2), "r" (__futex) \
+ : "r0", "r1", "t", "memory"); \
+ if (__result) \
+ __lll_mutex_lock_wait (__result, __futex); })
+
+#define lll_mutex_timedlock(futex, timeout) \
+ ({ int __result, *__futex = &(futex); \
+ __asm __volatile ("\
+ .align 2\n\
+ mova 1f,r0\n\
+ nop\n\
+ mov r15,r1\n\
+ mov #-8,r15\n\
+ 0: mov.l @%2,%0\n\
+ tst %0,%0\n\
+ bf 1f\n\
+ mov.l %1,@%2\n\
+ 1: mov r1,r15"\
+ : "=&r" (__result) : "r" (1), "r" (__futex) \
+ : "r0", "r1", "t", "memory"); \
+ if (__result) \
+ __result = __lll_mutex_timedlock_wait (__result, __futex, timeout); \
+ __result; })
+
+#define lll_mutex_unlock(futex) \
+ (void) ({ int __result, *__futex = &(futex); \
+ __asm __volatile ("\
+ .align 2\n\
+ mova 1f,r0\n\
+ mov r15,r1\n\
+ mov #-6,r15\n\
+ 0: mov.l @%1,%0\n\
+ add #-1,%0\n\
+ mov.l %0,@%1\n\
+ 1: mov r1,r15"\
+ : "=&r" (__result) : "r" (__futex) \
+ : "r0", "r1", "memory"); \
+ if (__result) \
+ __lll_mutex_unlock_wake (__futex); })
+
+#define lll_mutex_islocked(futex) \
+ (futex != 0)
+
+
+/* We have a separate internal lock implementation which is not tied
+ to binary compatibility. */
+
+/* Type for lock object. */
+typedef int lll_lock_t;
+
+/* Initializers for lock. */
+#define LLL_LOCK_INITIALIZER (0)
+#define LLL_LOCK_INITIALIZER_LOCKED (1)
+
+
+# ifdef NEED_SYSCALL_INST_PAD
+# define SYSCALL_WITH_INST_PAD "\
+ trapa #0x14; or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0"
+# else
+# define SYSCALL_WITH_INST_PAD "\
+ trapa #0x14"
+# endif
+
+#define lll_futex_wait(futex, val) \
+ do { \
+ int __ignore; \
+ register unsigned long __r3 __asm ("r3") = SYS_futex; \
+ register unsigned long __r4 __asm ("r4") = (unsigned long) (futex); \
+ register unsigned long __r5 __asm ("r5") = FUTEX_WAIT; \
+ register unsigned long __r6 __asm ("r6") = (unsigned long) (val); \
+ register unsigned long __r7 __asm ("r7") = 0; \
+ __asm __volatile (SYSCALL_WITH_INST_PAD \
+ : "=z" (__ignore) \
+ : "r" (__r3), "r" (__r4), "r" (__r5), \
+ "r" (__r6), "r" (__r7) \
+ : "memory", "t"); \
+ } while (0)
+
+#define lll_futex_timed_wait(futex, val, timeout) \
+ ({ \
+ int __status; \
+ register unsigned long __r3 __asm ("r3") = SYS_futex; \
+ register unsigned long __r4 __asm ("r4") = (unsigned long) (futex); \
+ register unsigned long __r5 __asm ("r5") = FUTEX_WAIT; \
+ register unsigned long __r6 __asm ("r6") = (unsigned long) (val); \
+ register unsigned long __r7 __asm ("r7") = (timeout); \
+ __asm __volatile (SYSCALL_WITH_INST_PAD \
+ : "=z" (__status) \
+ : "r" (__r3), "r" (__r4), "r" (__r5), \
+ "r" (__r6), "r" (__r7) \
+ : "memory", "t"); \
+ __status; \
+ })
+
+
+#define lll_futex_wake(futex, nr) \
+ do { \
+ int __ignore; \
+ register unsigned long __r3 __asm ("r3") = SYS_futex; \
+ register unsigned long __r4 __asm ("r4") = (unsigned long) (futex); \
+ register unsigned long __r5 __asm ("r5") = FUTEX_WAKE; \
+ register unsigned long __r6 __asm ("r6") = (unsigned long) (nr); \
+ register unsigned long __r7 __asm ("r7") = 0; \
+ __asm __volatile (SYSCALL_WITH_INST_PAD \
+ : "=z" (__ignore) \
+ : "r" (__r3), "r" (__r4), "r" (__r5), \
+ "r" (__r6), "r" (__r7) \
+ : "memory", "t"); \
+ } while (0)
+
+
+extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
+
+
+/* The states of a lock are:
+ 0 - untaken
+ 1 - taken by one user
+ 2 - taken by more users */
+
+#define lll_trylock(futex) lll_mutex_trylock (futex)
+#define lll_lock(futex) lll_mutex_lock (futex)
+#define lll_unlock(futex) lll_mutex_unlock (futex)
+
+#define lll_islocked(futex) \
+ (futex != LLL_LOCK_INITIALIZER)
+
+
+/* The kernel notifies a process with uses CLONE_CLEARTID via futex
+ wakeup when the clone terminates. The memory location contains the
+ thread ID while the clone is running and is reset to zero
+ afterwards. */
+
+extern int __lll_wait_tid (int *tid) attribute_hidden;
+#define lll_wait_tid(tid) \
+ do { \
+ __typeof (tid) *__tid = &(tid); \
+ while (*__tid != 0) \
+ lll_futex_wait (__tid, *__tid); \
+ } while (0)
+
+extern int __lll_timedwait_tid (int *tid, const struct timespec *abstime)
+ attribute_hidden;
+#define lll_timedwait_tid(tid, abstime) \
+ ({ \
+ int __result = 0; \
+ if (tid != 0) \
+ { \
+ if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000) \
+ __result = EINVAL; \
+ else \
+ __result = __lll_timedwait_tid (&tid, abstime); \
+ } \
+ __result; })
+
+
+/* Conditional variable handling. */
+
+extern void __lll_cond_wait (pthread_cond_t *cond) attribute_hidden;
+extern int __lll_cond_timedwait (pthread_cond_t *cond,
+ const struct timespec *abstime)
+ attribute_hidden;
+extern void __lll_cond_wake (pthread_cond_t *cond) attribute_hidden;
+extern void __lll_cond_broadcast (pthread_cond_t *cond) attribute_hidden;
+
+
+#define lll_cond_wait(cond) \
+ __lll_cond_wait (cond)
+#define lll_cond_timedwait(cond, abstime) \
+ __lll_cond_timedwait (cond, abstime)
+#define lll_cond_wake(cond) \
+ __lll_cond_wake (cond)
+#define lll_cond_broadcast(cond) \
+ __lll_cond_broadcast (cond)
+
+#endif /* lowlevellock.h */