Added simple silly stupid test.

tests/CMakeLists.txt

@@ -14,6 +14,8 @@ include_directories(${GLFW_SOURCE_DIR}/include
 
 set(GETOPT ${GLFW_SOURCE_DIR}/support/getopt.h
            ${GLFW_SOURCE_DIR}/support/getopt.c)
+set(TINYCTHREAD ${GLFW_SOURCE_DIR}/support/tinycthread.h
+                ${GLFW_SOURCE_DIR}/support/tinycthread.c) 
 
 add_executable(clipboard clipboard.c ${GETOPT})
 add_executable(defaults defaults.c)
@@ -27,6 +29,7 @@ add_executable(joysticks joysticks.c)
 add_executable(modes modes.c ${GETOPT})
 add_executable(peter peter.c)
 add_executable(reopen reopen.c)
+add_executable(threads threads.c ${TINYCTHREAD})
 
 add_executable(accuracy WIN32 MACOSX_BUNDLE accuracy.c)
 set_target_properties(accuracy PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Accuracy")
@@ -45,7 +48,7 @@ set_target_properties(windows PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Windows")
 
 set(WINDOWS_BINARIES accuracy sharing tearing title windows)
 set(CONSOLE_BINARIES clipboard defaults events fsaa fsfocus gamma glfwinfo
-                     iconify joysticks modes peter reopen)
+                     iconify joysticks modes peter reopen threads)
 
 if (MSVC)
     # Tell MSVC to use main instead of WinMain for Windows subsystem executables

tests/threads.c

@@ -0,0 +1,96 @@
+//========================================================================
+// Multithreading test
+// Copyright (c) Camilla Berglund <elmindreda@elmindreda.org>
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would
+//    be appreciated but is not required.
+//
+// 2. Altered source versions must be plainly marked as such, and must not
+//    be misrepresented as being the original software.
+//
+// 3. This notice may not be removed or altered from any source
+//    distribution.
+//
+//========================================================================
+//
+// This test is intended to verify whether the OpenGL context part of
+// the GLFW API is able to be used from multiple threads
+//
+//========================================================================
+
+#include <GL/glfw3.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+#include "tinycthread.h"
+
+static GLboolean running = GL_TRUE;
+
+static int thread_start(void* data)
+{
+    GLFWwindow window = (GLFWwindow) data;
+
+    glfwMakeContextCurrent(window);
+    glfwSwapInterval(1);
+
+    while (running)
+    {
+        const float red = (float) sin(glfwGetTime()) / 2.f + 0.5f;
+
+        glClearColor(red, 0.f, 0.f, 0.f);
+        glClear(GL_COLOR_BUFFER_BIT);
+        glfwSwapBuffers(window);
+    }
+
+    glfwMakeContextCurrent(NULL);
+    return 0;
+}
+
+int main(void)
+{
+    int result;
+    GLFWwindow window;
+    thrd_t thread;
+
+    if (!glfwInit())
+    {
+        fprintf(stderr, "Failed to initialize GLFW: %s\n", glfwErrorString(glfwGetError()));
+        exit(EXIT_FAILURE);
+    }
+
+    window = glfwCreateWindow(640, 480, GLFW_WINDOWED, "Multithreading", NULL);
+    if (!window)
+    {
+        fprintf(stderr, "Failed to open GLFW window: %s\n", glfwErrorString(glfwGetError()));
+        exit(EXIT_FAILURE);
+    }
+
+    if (thrd_create(&thread, thread_start, window) == thrd_success)
+    {
+        while (!glfwGetWindowParam(window, GLFW_CLOSE_REQUESTED))
+            glfwPollEvents();
+
+        running = GL_FALSE;
+        thrd_join(thread, &result);
+    }
+    else
+    {
+        fprintf(stderr, "Failed to create secondary thread\n");
+        exit(EXIT_FAILURE);
+    }
+
+    exit(EXIT_SUCCESS);
+}
+