Add browser test for file IO in pthreads.

tests/pthread/test_pthread_file_io.cpp

@@ -0,0 +1,45 @@
+#include <pthread.h>
+#include <emscripten.h>
+#include <emscripten/threading.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+static void *thread1_start(void *arg)
+{
+  EM_ASM(Module['print']('thread1_start!'););
+
+  FILE *handle = fopen("file1.txt", "r");
+  assert(handle);
+  char str[256] = {};
+  fgets(str, 255, handle);
+  fclose(handle);
+  assert(!strcmp(str, "hello!"));
+
+  handle = fopen("file2.txt", "w");
+  fputs("hello2!", handle);
+  fclose(handle);
+
+  pthread_exit(0);
+}
+
+int main()
+{
+  FILE *handle = fopen("file1.txt", "w");
+  fputs("hello!", handle);
+  fclose(handle);
+  pthread_t thr;
+  pthread_create(&thr, NULL, thread1_start, 0);
+  pthread_join(thr, 0);
+
+  handle = fopen("file2.txt", "r");
+  char str[256] = {};
+  fgets(str, 255, handle);
+  fclose(handle);
+  assert(!strcmp(str, "hello2!"));
+
+#ifdef REPORT_RESULT
+  int result = 0;
+  REPORT_RESULT();
+#endif
+}

tests/test_browser.py

@@ -2594,6 +2594,10 @@ window.close = function() {
   def test_pthread_setspecific_mainthread(self):
     self.btest(path_from_root('tests', 'pthread', 'test_pthread_setspecific_mainthread.cpp'), expected='0', args=['-lpthread'])
 
+  # Test that pthreads have access to filesystem.
+  def test_pthread_file_io(self):
+    self.btest(path_from_root('tests', 'pthread', 'test_pthread_file_io.cpp'), expected='0', args=['-lpthread', '-s', 'PTHREAD_POOL_SIZE=1'])
+
   # Test that it is possible to send a signal via calling alarm(timeout), which in turn calls to the signal handler set by signal(SIGALRM, func);
   def test_sigalrm(self):
     self.btest(path_from_root('tests', 'sigalrm.cpp'), expected='0')