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82 lines
3.0 KiB
C
82 lines
3.0 KiB
C
// Copyright (c) 2020 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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// hands over that output to the request handler function.
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//
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// The following procedure is used to benchmark the multi-threaded codepath
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// against the single-threaded codepath on MacOS:
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// $ make clean all CFLAGS="-DSLEEP_TIME=0 -DMG_ENABLE_SOCKETPAIR=1"
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// $ siege -c50 -t5s http://localhost:8000/multi
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// $ siege -c50 -t5s http://localhost:8000/fast
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//
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// If, during the test, there are socket errors, increase ephemeral port limit:
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// $ sysctl -a | grep portrange
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// $ sudo sysctl -w net.inet.ip.portrange.first=32768
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// $ sudo sysctl -w net.inet.ip.portrange.hifirst=32768
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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, (void *(*) (void *) ) f, p);
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pthread_attr_destroy(&attr);
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#endif
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}
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static void thread_function(void *param) {
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struct mg_connection *c = param; // Pipe connection
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mg_usleep(2 * 1000000); // Simulate long execution
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mg_mgr_wakeup(c); // Wakeup event manager
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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, void *fn_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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c->label[0] = 'W'; // Mark us as waiting for data
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start_thread(thread_function, fn_data); // Start handling thread
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}
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}
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}
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// Pipe event handler
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static void pcb(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
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if (ev == MG_EV_READ) {
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struct mg_connection *t;
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for (t = c->mgr->conns; t != NULL; t = t->next) {
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if (t->label[0] != 'W') continue; // Ignore un-marked connections
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mg_http_reply(t, 200, "Host: foo.com\r\n", "hi\n"); // Respond!
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t->label[0] = 0; // Clear mark
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}
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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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struct mg_connection *pipe; // Used to wake up event manager
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mg_mgr_init(&mgr);
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mg_log_set("3");
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pipe = mg_mkpipe(&mgr, pcb, NULL); // Create pipe
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mg_http_listen(&mgr, "http://localhost:8000", fn, pipe); // Create listener
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for (;;) mg_mgr_poll(&mgr, 1000); // Event loop
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mg_mgr_free(&mgr); // Cleanup
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return 0;
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}
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