patch-2.2.4 linux/include/asm-sparc64/semaphore-helper.h

• Lines: 69
• Date: Wed Mar 10 16:53:38 1999
• Orig file: v2.2.3/linux/include/asm-sparc64/semaphore-helper.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.2.3/linux/include/asm-sparc64/semaphore-helper.h linux/include/asm-sparc64/semaphore-helper.h
@@ -0,0 +1,68 @@
+#ifndef _SPARC64_SEMAPHORE_HELPER_H
+#define _SPARC64_SEMAPHORE_HELPER_H
+
+/*
+ * SMP- and interrupt-safe semaphore helper functions, sparc64 version.
+ *
+ * (C) Copyright 1999 David S. Miller (davem@redhat.com)
+ * (C) Copyright 1999 Jakub Jelinek (jj@ultra.linux.cz)
+ */
+#define wake_one_more(__sem)      atomic_inc(&((__sem)->waking));
+#define waking_non_zero(__sem)				\
+({	int __ret;					\
+	__asm__ __volatile__(				\
+"1:	ldsw		[%1], %%g5\n\t"			\
+	"brlez,pt	%%g5, 2f\n\t"			\
+	" mov		0, %0\n\t"			\
+	"sub		%%g5, 1, %%g7\n\t"		\
+	"cas		[%1], %%g5, %%g7\n\t"		\
+	"cmp		%%g5, %%g7\n\t"			\
+	"bne,pn		%%icc, 1b\n\t"			\
+	" mov		1, %0\n"			\
+"2:"	: "=&r" (__ret)					\
+	: "r" (&((__sem)->waking))			\
+	: "g5", "g7", "cc", "memory");			\
+	__ret;						\
+})
+
+#define waking_non_zero_interruptible(__sem, __tsk)	\
+({	int __ret;					\
+	__asm__ __volatile__(				\
+"1:	ldsw		[%1], %%g5\n\t"			\
+	"brlez,pt	%%g5, 2f\n\t"			\
+	" mov		0, %0\n\t"			\
+	"sub		%%g5, 1, %%g7\n\t"		\
+	"cas		[%1], %%g5, %%g7\n\t"		\
+	"cmp		%%g5, %%g7\n\t"			\
+	"bne,pn		%%icc, 1b\n\t"			\
+	" mov		1, %0\n"			\
+"2:"	: "=&r" (__ret)					\
+	: "r" (&((__sem)->waking))			\
+	: "g5", "g7", "cc", "memory");			\
+	if(__ret == 0 && signal_pending(__tsk)) {	\
+		atomic_inc(&((__sem)->count));		\
+		__ret = -EINTR;				\
+	}						\
+	__ret;						\
+})
+
+#define waking_non_zero_trylock(__sem)			\
+({	int __ret;					\
+	__asm__ __volatile__(				\
+"1:	ldsw		[%1], %%g5\n\t"			\
+	"brlez,pt	%%g5, 2f\n\t"			\
+	" mov		1, %0\n\t"			\
+	"sub		%%g5, 1, %%g7\n\t"		\
+	"cas		[%1], %%g5, %%g7\n\t"		\
+	"cmp		%%g5, %%g7\n\t"			\
+	"bne,pn		%%icc, 1b\n\t"			\
+	" mov		0, %0\n"			\
+"2:"	: "=&r" (__ret)					\
+	: "r" (&((__sem)->waking))			\
+	: "g5", "g7", "cc", "memory");			\
+	if(__ret == 1)					\
+		atomic_inc(&((__sem)->count));		\
+	__ret;						\
+})
+
+#endif /* !(_SPARC64_SEMAPHORE_HELPER_H) */