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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 | #ifndef __LINUX_SPINLOCK_H #define __LINUX_SPINLOCK_H #include <linux/config.h> /* * These are the generic versions of the spinlocks and read-write * locks.. */ #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) #ifdef CONFIG_SMP #include <asm/spinlock.h> #else /* !SMP */ #define DEBUG_SPINLOCKS 0 /* 0 == no debugging, 1 == maintain lock state, 2 == full debug */ #if (DEBUG_SPINLOCKS < 1) #define atomic_dec_and_lock(atomic,lock) atomic_dec_and_test(atomic) /* * Your basic spinlocks, allowing only a single CPU anywhere * * Most gcc versions have a nasty bug with empty initializers. */ #if (__GNUC__ > 2) typedef struct { } spinlock_t; #define SPIN_LOCK_UNLOCKED (spinlock_t) { } #else typedef struct { int gcc_is_buggy; } spinlock_t; #define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 } #endif #define spin_lock_init(lock) do { } while(0) #define spin_lock(lock) (void)(lock) /* Not "unused variable". */ #define spin_is_locked(lock) (0) #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 long lock; } spinlock_t; #define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 } #define spin_lock_init(x) do { (x)->lock = 0; } while (0) #define spin_is_locked(lock) (test_bit(0,(lock))) #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 long 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_is_locked(lock) (test_bit(0,(lock))) #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. * * Most gcc versions have a nasty bug with empty initializers. */ #if (__GNUC__ > 2) typedef struct { } rwlock_t; #define RW_LOCK_UNLOCKED (rwlock_t) { } #else typedef struct { int gcc_is_buggy; } rwlock_t; #define RW_LOCK_UNLOCKED (rwlock_t) { 0 } #endif #define rwlock_init(lock) do { } while(0) #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) #endif /* !SMP */ /* "lock on reference count zero" */ #ifndef atomic_dec_and_lock #include <asm/atomic.h> extern int atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock); #endif #endif /* __LINUX_SPINLOCK_H */ |