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from_thread.cpp
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94 lines (86 loc) · 3.1 KB
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// Copyright 2021 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
#include <string.h>
#include <stdio.h>
#include <math.h>
#include <assert.h>
#include <emscripten/fetch.h>
#include <pthread.h>
int result = 0;
void* thread_main(void* arg) {
emscripten_fetch_attr_t attr;
emscripten_fetch_attr_init(&attr);
strcpy(attr.requestMethod, "GET");
attr.userData = (void*)0x12345678;
attr.attributes = EMSCRIPTEN_FETCH_REPLACE | EMSCRIPTEN_FETCH_LOAD_TO_MEMORY;
attr.onsuccess = [](emscripten_fetch_t *fetch) {
assert(fetch);
printf("Finished downloading %llu bytes\n", fetch->numBytes);
assert(fetch->url);
assert(!strcmp(fetch->url, "gears.png"));
assert(fetch->id != 0);
assert((uintptr_t)fetch->userData == 0x12345678);
assert(fetch->totalBytes == 6407);
assert(fetch->numBytes == fetch->totalBytes);
assert(fetch->data != 0);
// Compute rudimentary checksum of data
uint8_t checksum = 0;
for(int i = 0; i < fetch->numBytes; ++i)
checksum ^= fetch->data[i];
printf("Data checksum: %02X\n", checksum);
assert(checksum == 0x08);
emscripten_fetch_close(fetch);
result = 42;
#ifdef DO_PTHREAD_EXIT
pthread_exit(&result);
#endif
};
attr.onprogress = [](emscripten_fetch_t *fetch) {
assert(fetch);
if (fetch->status != 200) return;
printf("onprogress: dataOffset: %llu, numBytes: %llu, totalBytes: %llu\n", fetch->dataOffset, fetch->numBytes, fetch->totalBytes);
if (fetch->totalBytes > 0) {
printf("Downloading.. %.2f%% complete.\n", (fetch->dataOffset + fetch->numBytes) * 100.0 / fetch->totalBytes);
} else {
printf("Downloading.. %lld bytes complete.\n", fetch->dataOffset + fetch->numBytes);
}
// We must receive a call to the onprogress handler with 100% completion.
if (fetch->dataOffset + fetch->numBytes == fetch->totalBytes) ++result;
assert(fetch->dataOffset + fetch->numBytes <= fetch->totalBytes);
assert(fetch->url);
assert(!strcmp(fetch->url, "gears.png"));
assert(fetch->id != 0);
assert((uintptr_t)fetch->userData == 0x12345678);
};
attr.onerror = [](emscripten_fetch_t *fetch) {
assert(false && "onerror handler called, but the transfer should have succeeded!");
result = 43;
#ifdef DO_PTHREAD_EXIT
pthread_exit(&result);
#endif
};
emscripten_fetch_t *fetch = emscripten_fetch(&attr, "gears.png");
assert(fetch);
static int my_result = 99;
return (void*)&my_result;
}
int main() {
pthread_t thread;
pthread_create(&thread, NULL, thread_main, NULL);
int* res;
printf("joining fetch thread\n");
pthread_join(thread, (void**)&res);
printf("join done\n");
printf("fetch thread complete: result=%d\n", *res);
#if DO_PTHREAD_EXIT
// if we don't use pthread_exit then exit status should be &result
assert(res == &result);
#else
// if we don't use pthread_exit then we expect the exit status to
// be what was returned from thread_main.
assert(*res == 99);
#endif
return 0;
}