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75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
// Copyright (c) 2020-2023 Cesanta Software Limited
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// All rights reserved
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//
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// Multithreading example.
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// For each incoming request, we spawn a separate thread, that sleeps for
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// some time to simulate long processing time, produces an output and
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// sends that output to the parent connection.
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#include "mongoose.h"
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static void start_thread(void *(*f)(void *), void *p) {
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#ifdef _WIN32
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_beginthread((void(__cdecl *)(void *)) f, 0, p);
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#else
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#define closesocket(x) close(x)
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#include <pthread.h>
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pthread_t thread_id = (pthread_t) 0;
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pthread_attr_t attr;
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(void) pthread_attr_init(&attr);
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(void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
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pthread_create(&thread_id, &attr, f, p);
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pthread_attr_destroy(&attr);
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#endif
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}
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struct thread_data {
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struct mg_mgr *mgr;
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unsigned long conn_id; // Parent connection ID
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struct mg_str message; // Original HTTP request
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};
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static void *thread_function(void *param) {
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struct thread_data *p = (struct thread_data *) param;
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sleep(2); // Simulate long execution
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mg_wakeup(p->mgr, p->conn_id, "hi!", 3); // Respond to parent
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free((void *) p->message.ptr); // Free all resources that were
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free(p); // passed to us
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return NULL;
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}
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// HTTP request callback
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static void fn(struct mg_connection *c, int ev, void *ev_data) {
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if (ev == MG_EV_HTTP_MSG) {
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struct mg_http_message *hm = (struct mg_http_message *) ev_data;
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if (mg_http_match_uri(hm, "/fast")) {
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// Single-threaded code path, for performance comparison
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// The /fast URI responds immediately
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mg_http_reply(c, 200, "Host: foo.com\r\n", "hi\n");
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} else {
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// Multithreading code path
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struct thread_data *data = calloc(1, sizeof(*data)); // Worker owns it
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data->message = mg_strdup(hm->message); // Pass message
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data->conn_id = c->id;
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data->mgr = c->mgr;
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start_thread(thread_function, data); // Start thread and pass data
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}
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} else if (ev == MG_EV_WAKEUP) {
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struct mg_str *data = (struct mg_str *) ev_data;
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mg_http_reply(c, 200, "", "Result: %.*s\n", data->len, data->ptr);
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}
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}
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int main(void) {
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struct mg_mgr mgr;
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mg_mgr_init(&mgr); // Initialise event manager
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mg_log_set(MG_LL_DEBUG); // Set debug log level
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mg_http_listen(&mgr, "http://localhost:8000", fn, NULL); // Create listener
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mg_wakeup_init(&mgr); // Initialise wakeup socket pair
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for (;;) { // Event loop
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mg_mgr_poll(&mgr, 1000);
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}
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mg_mgr_free(&mgr);
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return 0;
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}
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