patch-2.3.16 linux/include/asm-sh/spinlock.h

• Lines: 109
• Date: Mon Aug 30 18:12:59 1999
• Orig file: v2.3.15/linux/include/asm-sh/spinlock.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.15/linux/include/asm-sh/spinlock.h linux/include/asm-sh/spinlock.h
@@ -0,0 +1,108 @@
+#ifndef __ASM_SH_SPINLOCK_H
+#define __ASM_SH_SPINLOCK_H
+
+/*
+ * These are the generic versions of the spinlocks
+ * and read-write locks.. We should actually do a
+ * <linux/spinlock.h> with all of this. Oh, well.
+ */
+#define spin_lock_irqsave(lock, flags)		do { local_irq_save(flags);       spin_lock(lock); } while (0)
+#define spin_lock_irq(lock)			do { local_irq_disable();         spin_lock(lock); } while (0)
+#define spin_lock_bh(lock)			do { local_bh_disable();          spin_lock(lock); } while (0)
+
+#define read_lock_irqsave(lock, flags)		do { local_irq_save(flags);       read_lock(lock); } while (0)
+#define read_lock_irq(lock)			do { local_irq_disable();         read_lock(lock); } while (0)
+#define read_lock_bh(lock)			do { local_bh_disable();          read_lock(lock); } while (0)
+
+#define write_lock_irqsave(lock, flags)		do { local_irq_save(flags);      write_lock(lock); } while (0)
+#define write_lock_irq(lock)			do { local_irq_disable();        write_lock(lock); } while (0)
+#define write_lock_bh(lock)			do { local_bh_disable();         write_lock(lock); } while (0)
+
+#define spin_unlock_irqrestore(lock, flags)	do { spin_unlock(lock);  local_irq_restore(flags); } while (0)
+#define spin_unlock_irq(lock)			do { spin_unlock(lock);  local_irq_enable();       } while (0)
+#define spin_unlock_bh(lock)			do { spin_unlock(lock);  local_bh_enable();        } while (0)
+
+#define read_unlock_irqrestore(lock, flags)	do { read_unlock(lock);  local_irq_restore(flags); } while (0)
+#define read_unlock_irq(lock)			do { read_unlock(lock);  local_irq_enable();       } while (0)
+#define read_unlock_bh(lock)			do { read_unlock(lock);  local_bh_enable();        } while (0)
+
+#define write_unlock_irqrestore(lock, flags)	do { write_unlock(lock); local_irq_restore(flags); } while (0)
+#define write_unlock_irq(lock)			do { write_unlock(lock); local_irq_enable();       } while (0)
+#define write_unlock_bh(lock)			do { write_unlock(lock); local_bh_enable();        } while (0)
+
+#ifndef __SMP__
+
+#define DEBUG_SPINLOCKS	0	/* 0 == no debugging, 1 == maintain lock state, 2 == full debug */
+
+#if (DEBUG_SPINLOCKS < 1)
+
+/*
+ * Your basic spinlocks, allowing only a single CPU anywhere
+ */
+typedef struct { } spinlock_t;
+#define SPIN_LOCK_UNLOCKED (spinlock_t) { }
+
+#define spin_lock_init(lock)	do { } while(0)
+#define spin_lock(lock)		(void)(lock) /* Not "unused variable". */
+#define spin_trylock(lock)	(1)
+#define spin_unlock_wait(lock)	do { } while(0)
+#define spin_unlock(lock)	do { } while(0)
+
+#elif (DEBUG_SPINLOCKS < 2)
+
+typedef struct {
+	volatile unsigned int lock;
+} spinlock_t;
+#define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 }
+
+#define spin_lock_init(x)	do { (x)->lock = 0; } while (0)
+#define spin_trylock(lock)	(!test_and_set_bit(0,(lock)))
+
+#define spin_lock(x)		do { (x)->lock = 1; } while (0)
+#define spin_unlock_wait(x)	do { } while (0)
+#define spin_unlock(x)		do { (x)->lock = 0; } while (0)
+
+#else /* (DEBUG_SPINLOCKS >= 2) */
+
+typedef struct {
+	volatile unsigned int lock;
+	volatile unsigned int babble;
+	const char *module;
+} spinlock_t;
+#define SPIN_LOCK_UNLOCKED (spinlock_t) { 0, 25, __BASE_FILE__ }
+
+#include <linux/kernel.h>
+
+#define spin_lock_init(x)	do { (x)->lock = 0; } while (0)
+#define spin_trylock(lock)	(!test_and_set_bit(0,(lock)))
+
+#define spin_lock(x)		do {unsigned long __spinflags; save_flags(__spinflags); cli(); if ((x)->lock&&(x)->babble) {printk("%s:%d: spin_lock(%s:%p) already locked\n", __BASE_FILE__,__LINE__, (x)->module, (x));(x)->babble--;} (x)->lock = 1; restore_flags(__spinflags);} while (0)
+#define spin_unlock_wait(x)	do {unsigned long __spinflags; save_flags(__spinflags); cli(); if ((x)->lock&&(x)->babble) {printk("%s:%d: spin_unlock_wait(%s:%p) deadlock\n", __BASE_FILE__,__LINE__, (x)->module, (x));(x)->babble--;} restore_flags(__spinflags);} while (0)
+#define spin_unlock(x)		do {unsigned long __spinflags; save_flags(__spinflags); cli(); if (!(x)->lock&&(x)->babble) {printk("%s:%d: spin_unlock(%s:%p) not locked\n", __BASE_FILE__,__LINE__, (x)->module, (x));(x)->babble--;} (x)->lock = 0; restore_flags(__spinflags);} while (0)
+
+#endif	/* DEBUG_SPINLOCKS */
+
+/*
+ * Read-write spinlocks, allowing multiple readers
+ * but only one writer.
+ *
+ * NOTE! it is quite common to have readers in interrupts
+ * but no interrupt writers. For those circumstances we
+ * can "mix" irq-safe locks - any writer needs to get a
+ * irq-safe write-lock, but readers can get non-irqsafe
+ * read-locks.
+ */
+typedef struct { } rwlock_t;
+#define RW_LOCK_UNLOCKED (rwlock_t) { }
+
+#define read_lock(lock)		(void)(lock) /* Not "unused variable". */
+#define read_unlock(lock)	do { } while(0)
+#define write_lock(lock)	(void)(lock) /* Not "unused variable". */
+#define write_unlock(lock)	do { } while(0)
+
+#else
+
+#error "No SMP on SH"
+
+#endif /* SMP */
+#endif /* __ASM_SH_SPINLOCK_H */