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>

1 files changed, 241 insertions, 0 deletions

diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h b/libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h
new file mode 100644
index 000000000..1f2f481d6
--- /dev/null
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h
@@ -0,0 +1,241 @@
+/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
+
+   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 <time.h>
+#include <sys/param.h>
+#include <bits/pthreadtypes.h>
+#include <atomic.h>
+
+
+#ifndef __NR_futex
+# define __NR_futex		221
+#endif
+#define FUTEX_WAIT		0
+#define FUTEX_WAKE		1
+#define FUTEX_REQUEUE		3
+#define FUTEX_CMP_REQUEUE	4
+
+/* Initializer for compatibility lock.	*/
+#define LLL_MUTEX_LOCK_INITIALIZER (0)
+
+#define lll_futex_wait(futexp, val) \
+  ({									      \
+    INTERNAL_SYSCALL_DECL (__err);					      \
+    long int __ret;							      \
+									      \
+    __ret = INTERNAL_SYSCALL (futex, __err, 4,				      \
+			      (futexp), FUTEX_WAIT, (val), 0);		      \
+    INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret;		      \
+  })
+
+#define lll_futex_timed_wait(futexp, val, timespec) \
+  ({									      \
+    INTERNAL_SYSCALL_DECL (__err);					      \
+    long int __ret;							      \
+									      \
+    __ret = INTERNAL_SYSCALL (futex, __err, 4,				      \
+			      (futexp), FUTEX_WAIT, (val), (timespec));	      \
+    INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret;		      \
+  })
+
+#define lll_futex_wake(futexp, nr) \
+  ({									      \
+    INTERNAL_SYSCALL_DECL (__err);					      \
+    long int __ret;							      \
+									      \
+    __ret = INTERNAL_SYSCALL (futex, __err, 4,				      \
+			      (futexp), FUTEX_WAKE, (nr), 0);		      \
+    INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret;		      \
+  })
+
+/* Returns non-zero if error happened, zero if success.  */
+#define lll_futex_requeue(futexp, nr_wake, nr_move, mutex, val) \
+  ({									      \
+    INTERNAL_SYSCALL_DECL (__err);					      \
+    long int __ret;							      \
+									      \
+    __ret = INTERNAL_SYSCALL (futex, __err, 6,				      \
+			      (futexp), FUTEX_CMP_REQUEUE, (nr_wake),	      \
+			      (nr_move), (mutex), (val));		      \
+    INTERNAL_SYSCALL_ERROR_P (__ret, __err);				      \
+  })
+
+#ifdef UP
+# define __lll_acq_instr	""
+# define __lll_rel_instr	""
+#else
+# define __lll_acq_instr	"isync"
+# define __lll_rel_instr	"sync"
+#endif
+
+/* Set *futex to 1 if it is 0, atomically.  Returns the old value */
+#define __lll_trylock(futex) \
+  ({ int __val;								      \
+     __asm __volatile ("1:	lwarx	%0,0,%2\n"			      \
+		       "	cmpwi	0,%0,0\n"			      \
+		       "	bne	2f\n"				      \
+		       "	stwcx.	%3,0,%2\n"			      \
+		       "	bne-	1b\n"				      \
+		       "2:	" __lll_acq_instr			      \
+		       : "=&r" (__val), "=m" (*futex)			      \
+		       : "r" (futex), "r" (1), "m" (*futex)		      \
+		       : "cr0", "memory");				      \
+     __val;								      \
+  })
+
+#define lll_mutex_trylock(lock)	__lll_trylock (&(lock))
+
+/* Set *futex to 2 if it is 0, atomically.  Returns the old value */
+#define __lll_cond_trylock(futex) \
+  ({ int __val;								      \
+     __asm __volatile ("1:	lwarx	%0,0,%2\n"			      \
+		       "	cmpwi	0,%0,0\n"			      \
+		       "	bne	2f\n"				      \
+		       "	stwcx.	%3,0,%2\n"			      \
+		       "	bne-	1b\n"				      \
+		       "2:	" __lll_acq_instr			      \
+		       : "=&r" (__val), "=m" (*futex)			      \
+		       : "r" (futex), "r" (2), "m" (*futex)		      \
+		       : "cr0", "memory");				      \
+     __val;								      \
+  })
+#define lll_mutex_cond_trylock(lock)	__lll_cond_trylock (&(lock))
+
+
+extern void __lll_lock_wait (int *futex) attribute_hidden;
+
+#define lll_mutex_lock(lock) \
+  (void) ({								      \
+    int *__futex = &(lock);						      \
+    if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 1, 0),\
+			  0) != 0)					      \
+      __lll_lock_wait (__futex);					      \
+  })
+
+#define lll_mutex_cond_lock(lock) \
+  (void) ({								      \
+    int *__futex = &(lock);						      \
+    if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 2, 0),\
+			  0) != 0)					      \
+      __lll_lock_wait (__futex);					      \
+  })
+
+extern int __lll_timedlock_wait
+  (int *futex, const struct timespec *) attribute_hidden;
+
+#define lll_mutex_timedlock(lock, abstime) \
+  ({									      \
+    int *__futex = &(lock);						      \
+    int __val = 0;							      \
+    if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 1, 0),\
+			  0) != 0)					      \
+      __val = __lll_timedlock_wait (__futex, abstime);			      \
+    __val;								      \
+  })
+
+#define lll_mutex_unlock(lock) \
+  ((void) ({								      \
+    int *__futex = &(lock);						      \
+    int __val = atomic_exchange_rel (__futex, 0);			      \
+    if (__builtin_expect (__val > 1, 0))				      \
+      lll_futex_wake (__futex, 1);					      \
+  }))
+
+#define lll_mutex_unlock_force(lock) \
+  ((void) ({								      \
+    int *__futex = &(lock);						      \
+    *__futex = 0;							      \
+    __asm __volatile (__lll_rel_instr ::: "memory");			      \
+    lll_futex_wake (__futex, 1);					      \
+  }))
+
+#define lll_mutex_islocked(futex) \
+  (futex != 0)
+
+
+/* Our internal lock implementation is identical to the binary-compatible
+   mutex implementation. */
+
+/* Type for lock object.  */
+typedef int lll_lock_t;
+
+/* Initializers for lock.  */
+#define LLL_LOCK_INITIALIZER		(0)
+#define LLL_LOCK_INITIALIZER_LOCKED	(1)
+
+extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
+
+/* The states of a lock are:
+    0  -  untaken
+    1  -  taken by one user
+   >1  -  taken by more users */
+
+#define lll_trylock(lock)	lll_mutex_trylock (lock)
+#define lll_lock(lock)		lll_mutex_lock (lock)
+#define lll_unlock(lock)	lll_mutex_unlock (lock)
+#define lll_islocked(lock)	lll_mutex_islocked (lock)
+
+/* The kernel notifies a process which 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.	*/
+#define lll_wait_tid(tid) \
+  do {									      \
+    __typeof (tid) __tid;						      \
+    while ((__tid = (tid)) != 0)					      \
+      lll_futex_wait (&(tid), __tid);					      \
+  } while (0)
+
+extern int __lll_timedwait_tid (int *, const struct timespec *)
+     attribute_hidden;
+
+#define lll_timedwait_tid(tid, abstime) \
+  ({									      \
+    int __res = 0;							      \
+    if ((tid) != 0)							      \
+      __res = __lll_timedwait_tid (&(tid), (abstime));			      \
+    __res;								      \
+  })
+
+
+/* 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 */