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#pragma once
#include <stdlib.h>
#include <pthread.h>
#define SLOTS_COUNT 256
#define CPU_CACHE_ALIGMENT 64
#if(__GNUC__ * 100 + __GNUC_MINOR__ * 10 + __GNUC_PATCHLEVEL__ >= 410)
#define atomic_inc(x) __sync_add_and_fetch((x),1)
#define atomic_dec(x) __sync_sub_and_fetch((x),1)
#define atomic_add(x,y) __sync_add_and_fetch((x),(y))
#define atomic_sub(x,y) __sync_sub_and_fetch((x),(y))
typedef long atomic_t;
#define ATOMIC_INIT(i) { (i) }
#define atomic_read(x) __sync_add_and_fetch((x),0)
#define atomic_set(x,y) __sync_lock_test_and_set((x),y)
#else
typedef long atomic_t;
#define atomic_inc(x) ((*(x))++)
#define atomic_dec(x) ((*(x))--)
#define atomic_add(x,y) ((*(x))+=(y))
#define atomic_sub(x,y) ((*(x))-=(y))
#define ATOMIC_INIT(i) { (i) }
#define atomic_read(x) (*(x))
#define atomic_set(x,y) ((*(x))=(y))
#endif
struct threadsafe_counter
{
long long lcounters[(CPU_CACHE_ALIGMENT/sizeof(long long))*SLOTS_COUNT];
};
static __thread long slot_id=-1;
static __thread pid_t thread_id=0;
inline int get_lcounter_offset()
{
int offset=0;
if(slot_id<0)
{
thread_id=pthread_self();
slot_id=random()%SLOTS_COUNT;
}
offset=(CPU_CACHE_ALIGMENT/sizeof(long long))*slot_id;
return offset;
}
inline void threadsafe_counter_add(struct threadsafe_counter* c, long long value)
{
int offset=get_lcounter_offset();
atomic_add(&(c->lcounters[offset]), value);
}
inline void threadsafe_counter_sub(struct threadsafe_counter* c, long long value)
{
int offset=get_lcounter_offset();
atomic_sub(&(c->lcounters[offset]), value);
}
inline long long threadsafe_counter_read(struct threadsafe_counter* c)
{
int i=0, offset=0;
long long value=0;
for(i=0; i<SLOTS_COUNT; i++)
{
offset=i*CPU_CACHE_ALIGMENT/sizeof(long long);
value+=atomic_read(&(c->lcounters[offset]));
}
return value;
}
inline void threadsafe_counter_set(struct threadsafe_counter* c, long long value)
{
int i=0, offset=0;
for(i=0; i<SLOTS_COUNT; i++)
{
offset=i*CPU_CACHE_ALIGMENT/sizeof(long long);
atomic_set(&(c->lcounters[offset]), 0);
}
atomic_set(&(c->lcounters[0]), value);
}
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