ReactOS  0.4.14-dev-583-g2a1ba2c
bit_spinlock.h File Reference

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Functions

static void bit_spin_lock (int bitnum, unsigned long *addr)
 
static int bit_spin_trylock (int bitnum, unsigned long *addr)
 
static void bit_spin_unlock (int bitnum, unsigned long *addr)
 
static void __bit_spin_unlock (int bitnum, unsigned long *addr)
 
static int bit_spin_is_locked (int bitnum, unsigned long *addr)
 

Function Documentation

◆ __bit_spin_unlock()

static void __bit_spin_unlock ( int  bitnum,
unsigned long addr 
)
inlinestatic

Definition at line 68 of file bit_spinlock.h.

69 {
70 #ifdef CONFIG_DEBUG_SPINLOCK
71  BUG_ON(!test_bit(bitnum, addr));
72 #endif
73 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
74  __clear_bit_unlock(bitnum, addr);
75 #endif
77  __release(bitlock);
78 }
static int test_bit(int nr, volatile const unsigned long *addr)
Definition: module.h:381
#define __release(x)
Definition: types.h:102
#define BUG_ON(c)
Definition: module.h:253
#define preempt_enable()
Definition: types.h:104
GLenum const GLvoid * addr
Definition: glext.h:9621

◆ bit_spin_is_locked()

static int bit_spin_is_locked ( int  bitnum,
unsigned long addr 
)
inlinestatic

Definition at line 83 of file bit_spinlock.h.

84 {
85 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
86  return test_bit(bitnum, addr);
87 #elif defined CONFIG_PREEMPT
88  return preempt_count();
89 #else
90  return 1;
91 #endif
92 }
static int test_bit(int nr, volatile const unsigned long *addr)
Definition: module.h:381
GLenum const GLvoid * addr
Definition: glext.h:9621

◆ bit_spin_lock()

static void bit_spin_lock ( int  bitnum,
unsigned long addr 
)
inlinestatic

Definition at line 10 of file bit_spinlock.h.

11 {
12  /*
13  * Assuming the lock is uncontended, this never enters
14  * the body of the outer loop. If it is contended, then
15  * within the inner loop a non-atomic test is used to
16  * busywait with less bus contention for a good time to
17  * attempt to acquire the lock bit.
18  */
20 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
21  while (unlikely(test_and_set_bit_lock(bitnum, addr))) {
22  while (test_bit(bitnum, addr)) {
24  cpu_relax();
26  }
27  }
28 #endif
29  __acquire(bitlock);
30 }
#define preempt_disable()
Definition: types.h:105
static int test_bit(int nr, volatile const unsigned long *addr)
Definition: module.h:381
#define preempt_enable()
Definition: types.h:104
GLenum const GLvoid * addr
Definition: glext.h:9621
#define __acquire(x)
Definition: types.h:101
#define unlikely
Definition: module.h:262

◆ bit_spin_trylock()

static int bit_spin_trylock ( int  bitnum,
unsigned long addr 
)
inlinestatic

Definition at line 35 of file bit_spinlock.h.

36 {
38 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
39  if (unlikely(test_and_set_bit_lock(bitnum, addr))) {
41  return 0;
42  }
43 #endif
44  __acquire(bitlock);
45  return 1;
46 }
#define preempt_disable()
Definition: types.h:105
#define preempt_enable()
Definition: types.h:104
GLenum const GLvoid * addr
Definition: glext.h:9621
#define __acquire(x)
Definition: types.h:101
#define unlikely
Definition: module.h:262

◆ bit_spin_unlock()

static void bit_spin_unlock ( int  bitnum,
unsigned long addr 
)
inlinestatic

Definition at line 51 of file bit_spinlock.h.

52 {
53 #ifdef CONFIG_DEBUG_SPINLOCK
54  BUG_ON(!test_bit(bitnum, addr));
55 #endif
56 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
57  clear_bit_unlock(bitnum, addr);
58 #endif
60  __release(bitlock);
61 }
static int test_bit(int nr, volatile const unsigned long *addr)
Definition: module.h:381
#define __release(x)
Definition: types.h:102
#define BUG_ON(c)
Definition: module.h:253
#define preempt_enable()
Definition: types.h:104
GLenum const GLvoid * addr
Definition: glext.h:9621