LIBSSH2 在多线程环境下的使用

libssh2 库使用openssl 加密时，要设置以下加锁回调(可以参见openssl 中mtest.c代码），另外一个更重要应注意地方是包含头文件时，一定要定义重要的宏（OPENSSL_THREAD_DEFINES）,否则加锁回调无效，导致无法在多线程环境当中使用

#include <openssl/buffer.h>
#include <openssl/crypto.h>

#define OPENSSL_THREAD_DEFINES
#include <openssl/opensslconf.h>
#if defined(OPENSSL_THREADS)
#include <pthread.h>
#endif

static pthread_mutex_t 
static long *lock_count;

extern "C" unsigned long pthreads_thread_id()
{
	unsigned long ret;
	ret=(unsigned long)pthread_self();
	return(ret);
}

extern "C" void pthreads_locking_callback(int mode, int type, const char *file, int line)
{
	//DLOG_DEBUG("pthreads_locking_callback");
	if (mode & CRYPTO_LOCK)
	{
		pthread_mutex_lock(&(lock_cs[type]));
		lock_count[type]++;
	}
	else
	{
		pthread_mutex_unlock(&(lock_cs[type]));
	}
}
extern "C" int thread_setup()
{
	int i = 0;
	lock_cs    = (pthread_mutex_t*)malloc(CRYPTO_num_locks() * sizeof(pthread_mutex_t));
	lock_count = (long *)malloc(CRYPTO_num_locks() * sizeof(long));
	for(i =0; i<CRYPTO_num_locks(); i++)
	{
		lock_count[i]=0;
		pthread_mutex_init(&(lock_cs[i]),NULL);
	}
	CRYPTO_set_id_callback(pthreads_thread_id);
	CRYPTO_set_locking_callback(pthreads_locking_callback);
    return 0;
}