Kannel: Open Source WAP and SMS gateway  $Revision: 5037 $
counter.c
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56 
57 /*
58  * gwlib/counter.c - a counter object
59  *
60  * This file implements the Counter objects declared in counter.h.
61  *
62  * Lars Wirzenius.
63  *
64  * Changed the counter type 'long' into 'unsigned long' so it wraps
65  * by itself. Just keep increasing it.
66  * Also added a counter_increase_with function.
67  * harrie@lisanza.net
68  */
69 
70 #include <limits.h>
71 
72 #include "gwlib.h"
73 
74 struct Counter
75 {
76 #ifdef HAVE_PTHREAD_SPINLOCK_T
77  pthread_spinlock_t lock;
78 #else
80 #endif
81  unsigned long n;
82 };
83 
84 
85 #ifdef HAVE_PTHREAD_SPINLOCK_T
86 #define lock(c) pthread_spin_lock(&c->lock)
87 #define unlock(c) pthread_spin_unlock(&c->lock)
88 #else
89 #define lock(c) mutex_lock(c->lock)
90 #define unlock(c) mutex_unlock(c->lock)
91 #endif
92 
93 
95 {
97 
98  counter = gw_malloc(sizeof(Counter));
99 #ifdef HAVE_PTHREAD_SPINLOCK_T
100  pthread_spin_init(&counter->lock, 0);
101 #else
102  counter->lock = mutex_create();
103 #endif
104 
105  counter->n = 0;
106  return counter;
107 }
108 
109 
111 {
112  if (counter == NULL)
113  return;
114 
115 #ifdef HAVE_PTHREAD_SPINLOCK_T
116  pthread_spin_destroy(&counter->lock);
117 #else
118  mutex_destroy(counter->lock);
119 #endif
120  gw_free(counter);
121 }
122 
124 {
125  unsigned long ret;
126 
127  lock(counter);
128  ret = counter->n;
129  ++counter->n;
130  unlock(counter);
131  return ret;
132 }
133 
134 unsigned long counter_increase_with(Counter *counter, unsigned long value)
135 {
136  unsigned long ret;
137 
138  lock(counter);
139  ret = counter->n;
140  counter->n += value;
141  unlock(counter);
142  return ret;
143 }
144 
146 {
147  unsigned long ret;
148 
149  lock(counter);
150  ret = counter->n;
151  unlock(counter);
152  return ret;
153 }
154 
156 {
157  unsigned long ret;
158 
159  lock(counter);
160  ret = counter->n;
161  if (counter->n > 0)
162  --counter->n;
163  unlock(counter);
164  return ret;
165 }
166 
167 unsigned long counter_set(Counter *counter, unsigned long n)
168 {
169  unsigned long ret;
170 
171  lock(counter);
172  ret = counter->n;
173  counter->n = n;
174  unlock(counter);
175  return ret;
176 }
void counter_destroy(Counter *counter)
Definition: counter.c:110
#define mutex_create()
Definition: thread.h:96
#define unlock(c)
Definition: counter.c:90
unsigned long counter_set(Counter *counter, unsigned long n)
Definition: counter.c:167
#define lock(c)
Definition: counter.c:89
unsigned long counter_decrease(Counter *counter)
Definition: counter.c:155
unsigned long counter_increase(Counter *counter)
Definition: counter.c:123
Counter * counter_create(void)
Definition: counter.c:94
unsigned long counter_increase_with(Counter *counter, unsigned long value)
Definition: counter.c:134
unsigned long counter_value(Counter *counter)
Definition: counter.c:145
void mutex_destroy(Mutex *mutex)
Definition: thread.c:97
Mutex * lock
Definition: counter.c:79
unsigned long n
Definition: counter.c:81
Definition: thread.h:76
static Counter * counter
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