Apache中多任务并发处理机制研究(1)

在初始化之前，分配记分板所用内容。从上面的代码中，我们看到，分配的内存除了sizeof(scoreboard)大小是我们意料之内的，剩余的两部分server_limit*sizeof(worker_score)和server_limit*lb_limit*sizeof(lb_score*)则有点出乎意料之外。这两部分内存的用处我们稍后介绍。

more_storage = shared_score;

ap_scoreboard_image->global = (global_score *)more_storage;

more_storage = sizeof(global_score);

ap_scoreboard_image->parent = (process_score *)more_storage;

more_storage = sizeof(process_score) * server_limit;

ap_scoreboard_image->servers =

(worker_score **)((char*)ap_scoreboard_image sizeof(scoreboard));

for (i = 0; i < server_limit; i ) {

ap_scoreboard_image->servers[i] = (worker_score *)more_storage;

more_storage = thread_limit * sizeof(worker_score);

}

if (lb_limit) {

ap_scoreboard_image->balancers = (lb_score *)more_storage;

more_storage = lb_limit * sizeof(lb_score);

}

对于传入的共享内存按照下面的顺序进行布局初始化：首先保存全局共享信息global_score，占用内存sizeof(global_score)；然后保存server_limit