什么时候需要curl_global_init()？

虽然它的文件说这个功能是必须的,但我看到两个例子,一个有,另一个没有.

http://curl.haxx.se/libcurl/c/persistant.html

http://curl.haxx.se/libcurl/c/multi-app.html

这个功能是否必要？

解决方法

如果它被设计,将是必要的. documentation说：

This function must be called at least once within a program (a program is all the code that shares a memory space) before the program calls any other function in libcurl. The environment it sets up is constant for the life of the program and is the same for every program,so multiple calls have the same effect as one call.

但请注意,在curl_easy_init的文件中：

If you did not already call curl_global_init(3),curl_easy_init(3) does it automatically. This may be lethal in multi-threaded cases,since curl_global_init(3) is not thread-safe,and it may result in resource problems because there is no corresponding cleanup.