Qt 4.8
qatomic_parisc.cpp
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41 
42 #include <QtCore/qglobal.h>
43 #include <QtCore/qhash.h>
44 
46 
48 
49 #define UNLOCKED {-1,-1,-1,-1}
50 #define UNLOCKED2 UNLOCKED,UNLOCKED
51 #define UNLOCKED4 UNLOCKED2,UNLOCKED2
52 #define UNLOCKED8 UNLOCKED4,UNLOCKED4
53 #define UNLOCKED16 UNLOCKED8,UNLOCKED8
54 #define UNLOCKED32 UNLOCKED16,UNLOCKED16
55 #define UNLOCKED64 UNLOCKED32,UNLOCKED32
56 #define UNLOCKED128 UNLOCKED64,UNLOCKED64
57 #define UNLOCKED256 UNLOCKED128,UNLOCKED128
58 
59 // use a 4k page for locks
60 static int locks[256][4] = { UNLOCKED256 };
61 
62 int *getLock(volatile void *addr)
63 { return locks[qHash(const_cast<void *>(addr)) % 256]; }
64 
65 static int *align16(int *lock)
66 {
67  ulong off = (((ulong) lock) % 16);
68  return off ? (int *)(ulong(lock) + 16 - off) : lock;
69 }
70 
71 extern "C" {
72 
73  int q_ldcw(volatile int *addr);
74 
75  void q_atomic_lock(int *lock)
76  {
77  // ldcw requires a 16-byte aligned address
78  volatile int *x = align16(lock);
79  while (q_ldcw(x) == 0)
80  ;
81  }
82 
83  void q_atomic_unlock(int *lock)
84  { lock[0] = lock[1] = lock[2] = lock[3] = -1; }
85 }
86 
87 
#define QT_END_NAMESPACE
This macro expands to.
Definition: qglobal.h:90
int * getLock(volatile void *addr)
#define UNLOCKED256
static int * align16(int *lock)
static int locks[256][4]
#define QT_BEGIN_NAMESPACE
This macro expands to.
Definition: qglobal.h:89
void q_atomic_lock(int *lock)
unsigned long ulong
Definition: qglobal.h:997
uint qHash(const QUrl &url)
Definition: qurl.h:285
static QReadWriteLock lock
Definition: proxyconf.cpp:399
#define QT_USE_NAMESPACE
This macro expands to using QT_NAMESPACE if QT_NAMESPACE is defined and nothing otherwise.
Definition: qglobal.h:88
void q_atomic_unlock(int *lock)
int q_ldcw(volatile int *addr)