blocxx
AtomicOps.cpp
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32 
33 
38 #include "blocxx/BLOCXX_config.h"
39 #include "blocxx/AtomicOps.hpp"
40 
41 #if defined(BLOCXX_USE_PTHREAD_SPIN_LOCK_ATOMIC_OPS)
42 
43 namespace BLOCXX_NAMESPACE
44 {
45 
46 Atomic_t::Atomic_t()
47  : val(0)
48 {
49  pthread_spin_init(&spinlock, 0);
50 }
51 Atomic_t::Atomic_t(int i)
52  : val(i)
53 {
54  pthread_spin_init(&spinlock, 0);
55 }
56 void AtomicInc(Atomic_t &v)
57 {
58  pthread_spin_lock(&v.spinlock);
59  ++v.val;
60  pthread_spin_unlock(&v.spinlock);
61 }
62 bool AtomicDecAndTest(Atomic_t &v)
63 {
64  pthread_spin_lock(&v.spinlock);
65  --v.val;
66  bool b = ((v.val == 0) ? true : false) ;
67  pthread_spin_unlock(&v.spinlock);
68  return b;
69 }
70 int AtomicGet(Atomic_t const &v)
71 {
72  return v.val;
73 }
74 void AtomicDec(Atomic_t &v)
75 {
76  pthread_spin_lock(&v.spinlock);
77  --v.val;
78  pthread_spin_unlock(&v.spinlock);
79 }
80 
81 } // end namespace BLOCXX_NAMESPACE
82 
83 #elif defined(BLOCXX_USE_BLOCXX_DEFAULT_ATOMIC_OPS)
84 #include "blocxx/Mutex.hpp"
85 #include "blocxx/MutexLock.hpp"
86 #include "blocxx/ThreadOnce.hpp"
87 
88 namespace BLOCXX_NAMESPACE
89 {
90 
91 // this needs to be a pointer because of static initialization order conflicts.
92 // It shouldn't ever be deleted b/c it may be referenced by a destructor of a
93 // static variable that is being deleted.
94 static Mutex* guard = 0;
95 static OnceFlag g_once = BLOCXX_ONCE_INIT;
96 static void initGuard()
97 {
98  guard = new Mutex();
99 }
100 void AtomicInc(Atomic_t &v)
101 {
102  callOnce(g_once, initGuard);
103  MutexLock lock(*guard);
104  ++v.val;
105 }
106 bool AtomicDecAndTest(Atomic_t &v)
107 {
108  callOnce(g_once, initGuard);
109  MutexLock lock(*guard);
110  return --v.val == 0;
111 }
112 int AtomicGet(Atomic_t const &v)
113 {
114  callOnce(g_once, initGuard);
115  MutexLock lock(*guard);
116  return v.val;
117 }
118 void AtomicDec(Atomic_t &v)
119 {
120  callOnce(g_once, initGuard);
121  MutexLock lock(*guard);
122  --v.val;
123 }
124 
125 } // end namespace BLOCXX_NAMESPACE
126 
127 #endif
128 
129 
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