test/dri2-race: Use loops for iterating over divisor tests

Expand the test cases slightly to check high dividers everywhere.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 276 insertions, 420 deletions

diff --git a/test/dri2-race.c b/test/dri2-race.c
index 39e2bbd5..c8985627 100644
--- a/test/dri2-race.c
+++ b/test/dri2-race.c
@@ -21,6 +21,9 @@
 
 #define COUNT 60
 
+#define N_DIVISORS 3
+static const int divisors[N_DIVISORS] = { 0, 1, 16 };
+
 static uint32_t upper_32_bits(uint64_t val)
 {
 	return val >> 32;
@@ -80,7 +83,7 @@ static void race_window(Display *dpy, int width, int height,
 {
 	Window win;
 	XSetWindowAttributes attr;
-	int count, loop;
+	int count, loop, n;
 	DRI2Buffer *buffers;
 
 	printf("%s(%s)\n", __func__, name);
@@ -89,132 +92,94 @@ static void race_window(Display *dpy, int width, int height,
 	 * can guarantee we do not get clipped by children.
 	 */
 	attr.override_redirect = 1;
-	loop = 100;
-	do {
-		win = XCreateWindow(dpy, DefaultRootWindow(dpy),
-				    0, 0, width, height, 0,
-				    DefaultDepth(dpy, DefaultScreen(dpy)),
-				    InputOutput,
-				    DefaultVisual(dpy, DefaultScreen(dpy)),
-				    CWOverrideRedirect, &attr);
-		XMapWindow(dpy, win);
-
-		DRI2CreateDrawable(dpy, win);
-
-		buffers = DRI2GetBuffers(dpy, win, &width, &height,
-					 attachments, nattachments, &count);
-		if (count != nattachments)
-			return;
-
-		free(buffers);
-		for (count = 0; count < loop; count++)
-			DRI2SwapBuffers(dpy, win, 0, 0, 0);
-		XDestroyWindow(dpy, win);
-		printf("."); fflush(stdout);
-	} while (--loop);
-	printf("*\n");
-
-	loop = 100;
-	do {
-		win = XCreateWindow(dpy, DefaultRootWindow(dpy),
-				    0, 0, width, height, 0,
-				    DefaultDepth(dpy, DefaultScreen(dpy)),
-				    InputOutput,
-				    DefaultVisual(dpy, DefaultScreen(dpy)),
-				    CWOverrideRedirect, &attr);
-		XMapWindow(dpy, win);
-
-		DRI2CreateDrawable(dpy, win);
-
-		buffers = DRI2GetBuffers(dpy, win, &width, &height,
-					 attachments, nattachments, &count);
-		if (count != nattachments)
-			return;
-
-		free(buffers);
-		for (count = 0; count < loop; count++)
-			DRI2SwapBuffers(dpy, win, 0, 1, 0);
-		XDestroyWindow(dpy, win);
-		printf("."); fflush(stdout);
-	} while (--loop);
-	printf("*\n");
-
-	loop = 100;
-	do {
-		win = XCreateWindow(dpy, DefaultRootWindow(dpy),
-				    0, 0, width, height, 0,
-				    DefaultDepth(dpy, DefaultScreen(dpy)),
-				    InputOutput,
-				    DefaultVisual(dpy, DefaultScreen(dpy)),
-				    CWOverrideRedirect, &attr);
-		XMapWindow(dpy, win);
-
-		DRI2CreateDrawable(dpy, win);
-
-		buffers = DRI2GetBuffers(dpy, win, &width, &height,
-					 attachments, nattachments, &count);
-		if (count != nattachments)
-			return;
-
-		free(buffers);
-		for (count = 0; count < loop; count++)
-			swap_buffers(dpy, win, 0, attachments, nattachments);
-		XDestroyWindow(dpy, win);
-		printf("."); fflush(stdout);
-	} while (--loop);
-	printf("*\n");
-
-	loop = 100;
-	do {
-		win = XCreateWindow(dpy, DefaultRootWindow(dpy),
-				    0, 0, width, height, 0,
-				    DefaultDepth(dpy, DefaultScreen(dpy)),
-				    InputOutput,
-				    DefaultVisual(dpy, DefaultScreen(dpy)),
-				    CWOverrideRedirect, &attr);
-		XMapWindow(dpy, win);
-
-		DRI2CreateDrawable(dpy, win);
-
-		buffers = DRI2GetBuffers(dpy, win, &width, &height,
-					 attachments, nattachments, &count);
-		if (count != nattachments)
-			return;
-
-		free(buffers);
-		for (count = 0; count < loop; count++)
-			swap_buffers(dpy, win, 1, attachments, nattachments);
-		XDestroyWindow(dpy, win);
-		printf("."); fflush(stdout);
-	} while (--loop);
-	printf("*\n");
-
-	loop = 100;
-	do {
-		uint64_t ignore, msc;
-		xcb_connection_t *c = XGetXCBConnection(dpy);
-
-		win = XCreateWindow(dpy, DefaultRootWindow(dpy),
-				    0, 0, width, height, 0,
-				    DefaultDepth(dpy, DefaultScreen(dpy)),
-				    InputOutput,
-				    DefaultVisual(dpy, DefaultScreen(dpy)),
-				    CWOverrideRedirect, &attr);
-		XMapWindow(dpy, win);
-
-		DRI2CreateDrawable(dpy, win);
-		DRI2GetMSC(dpy, win, &ignore, &msc, &ignore);
-		for (count = 0; count < loop; count++)
-			xcb_discard_reply(c,
-					  xcb_dri2_wait_msc(c, win,
-							    upper_32_bits(msc + count + 1),
-							    lower_32_bits(msc + count + 1),
-							    0, 1, 0, 0).sequence);
-		XFlush(dpy);
-		XDestroyWindow(dpy, win);
-		printf("."); fflush(stdout);
-	} while (--loop);
-	printf("*\n");
+	for (n = 0; n < N_DIVISORS; n++) {
+		printf("DRI2SwapBuffers(divisor=%d)", divisors[n]);
+		loop = 100;
+		do {
+			win = XCreateWindow(dpy, DefaultRootWindow(dpy),
+					0, 0, width, height, 0,
+					DefaultDepth(dpy, DefaultScreen(dpy)),
+					InputOutput,
+					DefaultVisual(dpy, DefaultScreen(dpy)),
+					CWOverrideRedirect, &attr);
+			XMapWindow(dpy, win);
+
+			DRI2CreateDrawable(dpy, win);
+
+			buffers = DRI2GetBuffers(dpy, win, &width, &height,
+					attachments, nattachments, &count);
+			if (count != nattachments)
+				return;
+
+			free(buffers);
+			for (count = 0; count < loop; count++)
+				DRI2SwapBuffers(dpy, win, 0, divisors[n], count & (divisors[n]-1));
+			XDestroyWindow(dpy, win);
+			printf("."); fflush(stdout);
+		} while (--loop);
+		printf("*\n");
+	}
+
+	for (n = 0; n < N_DIVISORS; n++) {
+		printf("xcb_dri2_swap_buffers(divisor=%d)", divisors[n]);
+		loop = 100;
+		do {
+			win = XCreateWindow(dpy, DefaultRootWindow(dpy),
+					0, 0, width, height, 0,
+					DefaultDepth(dpy, DefaultScreen(dpy)),
+					InputOutput,
+					DefaultVisual(dpy, DefaultScreen(dpy)),
+					CWOverrideRedirect, &attr);
+			XMapWindow(dpy, win);
+
+			DRI2CreateDrawable(dpy, win);
+
+			buffers = DRI2GetBuffers(dpy, win, &width, &height,
+					attachments, nattachments, &count);
+			if (count != nattachments)
+				return;
+
+			free(buffers);
+			for (count = 0; count < loop; count++)
+				swap_buffers(dpy, win, divisors[n], attachments, nattachments);
+			XDestroyWindow(dpy, win);
+			printf("."); fflush(stdout);
+		} while (--loop);
+		printf("*\n");
+	}
+
+	for (n = 0; n < N_DIVISORS; n++) {
+		printf("DRI2WaitMsc(divisor=%d)", divisors[n]);
+		loop = 100;
+		do {
+			uint64_t ignore, msc;
+			xcb_connection_t *c = XGetXCBConnection(dpy);
+
+			win = XCreateWindow(dpy, DefaultRootWindow(dpy),
+					0, 0, width, height, 0,
+					DefaultDepth(dpy, DefaultScreen(dpy)),
+					InputOutput,
+					DefaultVisual(dpy, DefaultScreen(dpy)),
+					CWOverrideRedirect, &attr);
+			XMapWindow(dpy, win);
+
+			DRI2CreateDrawable(dpy, win);
+			DRI2GetMSC(dpy, win, &ignore, &msc, &ignore);
+			msc++;
+			for (count = 0; count < loop; count++) {
+				xcb_discard_reply(c,
+						xcb_dri2_wait_msc(c, win,
+							upper_32_bits(msc),
+							lower_32_bits(msc),
+							0, 1, 0, 0).sequence);
+				msc += divisors[n];
+			}
+			XFlush(dpy);
+			XDestroyWindow(dpy, win);
+			printf("."); fflush(stdout);
+		} while (--loop);
+		printf("*\n");
+	}
 
 	XSync(dpy, 1);
 	sleep(2);
@@ -228,7 +193,7 @@ static void race_manager(Display *dpy, int width, int height,
 	Display *mgr = XOpenDisplay(NULL);
 	Window win;
 	XSetWindowAttributes attr;
-	int count, loop;
+	int count, loop, n;
 	DRI2Buffer *buffers;
 
 	printf("%s(%s)\n", __func__, name);
@@ -237,195 +202,99 @@ static void race_manager(Display *dpy, int width, int height,
 	 * can guarantee we do not get clipped by children.
 	 */
 	attr.override_redirect = 1;
-	loop = 100;
-	do {
-		win = XCreateWindow(dpy, DefaultRootWindow(dpy),
-				    0, 0, width, height, 0,
-				    DefaultDepth(dpy, DefaultScreen(dpy)),
-				    InputOutput,
-				    DefaultVisual(dpy, DefaultScreen(dpy)),
-				    CWOverrideRedirect, &attr);
-		XMapWindow(dpy, win);
-
-		DRI2CreateDrawable(dpy, win);
-
-		buffers = DRI2GetBuffers(dpy, win, &width, &height,
-					 attachments, nattachments, &count);
-		if (count != nattachments)
-			return;
-
-		free(buffers);
-		for (count = 0; count < loop; count++)
-			DRI2SwapBuffers(dpy, win, 0, 0, 0);
-		XFlush(dpy);
-		XDestroyWindow(mgr, win);
-		XFlush(mgr);
-		printf("."); fflush(stdout);
-	} while (--loop);
-	printf("*\n");
-
-	loop = 100;
-	do {
-		win = XCreateWindow(dpy, DefaultRootWindow(dpy),
-				    0, 0, width, height, 0,
-				    DefaultDepth(dpy, DefaultScreen(dpy)),
-				    InputOutput,
-				    DefaultVisual(dpy, DefaultScreen(dpy)),
-				    CWOverrideRedirect, &attr);
-		XMapWindow(dpy, win);
-
-		DRI2CreateDrawable(dpy, win);
-
-		buffers = DRI2GetBuffers(dpy, win, &width, &height,
-					 attachments, nattachments, &count);
-		if (count != nattachments)
-			return;
-
-		free(buffers);
-		for (count = 0; count < loop; count++)
-			DRI2SwapBuffers(dpy, win, 0, 1, 0);
-		XFlush(dpy);
-		XDestroyWindow(mgr, win);
-		XFlush(mgr);
-		printf("."); fflush(stdout);
-	} while (--loop);
-	printf("*\n");
-
-	loop = 100;
-	do {
-		win = XCreateWindow(dpy, DefaultRootWindow(dpy),
-				    0, 0, width, height, 0,
-				    DefaultDepth(dpy, DefaultScreen(dpy)),
-				    InputOutput,
-				    DefaultVisual(dpy, DefaultScreen(dpy)),
-				    CWOverrideRedirect, &attr);
-		XMapWindow(dpy, win);
-
-		DRI2CreateDrawable(dpy, win);
-
-		buffers = DRI2GetBuffers(dpy, win, &width, &height,
-					 attachments, nattachments, &count);
-		if (count != nattachments)
-			return;
-
-		free(buffers);
-		for (count = 0; count < loop; count++)
-			DRI2SwapBuffers(dpy, win, 0, 16, count & 15);
-		XFlush(dpy);
-		XDestroyWindow(mgr, win);
-		XFlush(mgr);
-		printf("."); fflush(stdout);
-	} while (--loop);
-	printf("*\n");
-
-	loop = 100;
-	do {
-		win = XCreateWindow(dpy, DefaultRootWindow(dpy),
-				    0, 0, width, height, 0,
-				    DefaultDepth(dpy, DefaultScreen(dpy)),
-				    InputOutput,
-				    DefaultVisual(dpy, DefaultScreen(dpy)),
-				    CWOverrideRedirect, &attr);
-		XMapWindow(dpy, win);
-
-		DRI2CreateDrawable(dpy, win);
-
-		buffers = DRI2GetBuffers(dpy, win, &width, &height,
-					 attachments, nattachments, &count);
-		if (count != nattachments)
-			return;
-
-		free(buffers);
-		for (count = 0; count < loop; count++)
-			swap_buffers(dpy, win, 0, attachments, nattachments);
-		XFlush(dpy);
-		XDestroyWindow(mgr, win);
-		XFlush(mgr);
-		printf("."); fflush(stdout);
-	} while (--loop);
-	printf("*\n");
-
-	loop = 100;
-	do {
-		win = XCreateWindow(dpy, DefaultRootWindow(dpy),
-				    0, 0, width, height, 0,
-				    DefaultDepth(dpy, DefaultScreen(dpy)),
-				    InputOutput,
-				    DefaultVisual(dpy, DefaultScreen(dpy)),
-				    CWOverrideRedirect, &attr);
-		XMapWindow(dpy, win);
-
-		DRI2CreateDrawable(dpy, win);
-
-		buffers = DRI2GetBuffers(dpy, win, &width, &height,
-					 attachments, nattachments, &count);
-		if (count != nattachments)
-			return;
-
-		free(buffers);
-		for (count = 0; count < loop; count++)
-			swap_buffers(dpy, win, 1, attachments, nattachments);
-		XFlush(dpy);
-		XDestroyWindow(mgr, win);
-		XFlush(mgr);
-		printf("."); fflush(stdout);
-	} while (--loop);
-	printf("*\n");
-
-	loop = 100;
-	do {
-		win = XCreateWindow(dpy, DefaultRootWindow(dpy),
-				    0, 0, width, height, 0,
-				    DefaultDepth(dpy, DefaultScreen(dpy)),
-				    InputOutput,
-				    DefaultVisual(dpy, DefaultScreen(dpy)),
-				    CWOverrideRedirect, &attr);
-		XMapWindow(dpy, win);
-
-		DRI2CreateDrawable(dpy, win);
-
-		buffers = DRI2GetBuffers(dpy, win, &width, &height,
-					 attachments, nattachments, &count);
-		if (count != nattachments)
-			return;
-
-		free(buffers);
-		for (count = 0; count < loop; count++)
-			swap_buffers(dpy, win, 16, attachments, nattachments);
-		XFlush(dpy);
-		XDestroyWindow(mgr, win);
-		XFlush(mgr);
-		printf("."); fflush(stdout);
-	} while (--loop);
-	printf("*\n");
-
-	loop = 100;
-	do {
-		uint64_t ignore, msc;
-		xcb_connection_t *c = XGetXCBConnection(dpy);
-
-		win = XCreateWindow(dpy, DefaultRootWindow(dpy),
-				    0, 0, width, height, 0,
-				    DefaultDepth(dpy, DefaultScreen(dpy)),
-				    InputOutput,
-				    DefaultVisual(dpy, DefaultScreen(dpy)),
-				    CWOverrideRedirect, &attr);
-		XMapWindow(dpy, win);
-
-		DRI2CreateDrawable(dpy, win);
-		DRI2GetMSC(dpy, win, &ignore, &msc, &ignore);
-		for (count = 0; count < loop; count++)
-			xcb_discard_reply(c,
-					  xcb_dri2_wait_msc(c, win,
-							    upper_32_bits(msc + count + 1),
-							    lower_32_bits(msc + count + 1),
-							    0, 1, 0, 0).sequence);
-		XFlush(dpy);
-		XDestroyWindow(mgr, win);
-		XFlush(mgr);
-		printf("."); fflush(stdout);
-	} while (--loop);
-	printf("*\n");
+	for (n = 0; n < N_DIVISORS; n++) {
+		printf("DRI2SwapBuffers(divisor=%d)", divisors[n]);
+		loop = 100;
+		do {
+			win = XCreateWindow(dpy, DefaultRootWindow(dpy),
+					0, 0, width, height, 0,
+					DefaultDepth(dpy, DefaultScreen(dpy)),
+					InputOutput,
+					DefaultVisual(dpy, DefaultScreen(dpy)),
+					CWOverrideRedirect, &attr);
+			XMapWindow(dpy, win);
+
+			DRI2CreateDrawable(dpy, win);
+
+			buffers = DRI2GetBuffers(dpy, win, &width, &height,
+					attachments, nattachments, &count);
+			if (count != nattachments)
+				return;
+
+			free(buffers);
+			for (count = 0; count < loop; count++)
+				DRI2SwapBuffers(dpy, win, 0, divisors[n], count & (divisors[n]-1));
+			XFlush(dpy);
+			XDestroyWindow(mgr, win);
+			XFlush(mgr);
+			printf("."); fflush(stdout);
+		} while (--loop);
+		printf("*\n");
+	}
+
+	for (n = 0; n < N_DIVISORS; n++) {
+		printf("xcb_dri2_swap_buffers(divisor=%d)", divisors[n]);
+		loop = 100;
+		do {
+			win = XCreateWindow(dpy, DefaultRootWindow(dpy),
+					0, 0, width, height, 0,
+					DefaultDepth(dpy, DefaultScreen(dpy)),
+					InputOutput,
+					DefaultVisual(dpy, DefaultScreen(dpy)),
+					CWOverrideRedirect, &attr);
+			XMapWindow(dpy, win);
+
+			DRI2CreateDrawable(dpy, win);
+
+			buffers = DRI2GetBuffers(dpy, win, &width, &height,
+					attachments, nattachments, &count);
+			if (count != nattachments)
+				return;
+
+			free(buffers);
+			for (count = 0; count < loop; count++)
+				swap_buffers(dpy, win, divisors[n], attachments, nattachments);
+			XFlush(dpy);
+			XDestroyWindow(mgr, win);
+			XFlush(mgr);
+			printf("."); fflush(stdout);
+		} while (--loop);
+		printf("*\n");
+	}
+
+	for (n = 0; n < N_DIVISORS; n++) {
+		printf("DRI2WaitMsc(divisor=%d)", divisors[n]);
+		loop = 100;
+		do {
+			uint64_t ignore, msc;
+			xcb_connection_t *c = XGetXCBConnection(dpy);
+
+			win = XCreateWindow(dpy, DefaultRootWindow(dpy),
+					0, 0, width, height, 0,
+					DefaultDepth(dpy, DefaultScreen(dpy)),
+					InputOutput,
+					DefaultVisual(dpy, DefaultScreen(dpy)),
+					CWOverrideRedirect, &attr);
+			XMapWindow(dpy, win);
+
+			DRI2CreateDrawable(dpy, win);
+			DRI2GetMSC(dpy, win, &ignore, &msc, &ignore);
+			msc++;
+			for (count = 0; count < loop; count++) {
+				xcb_discard_reply(c,
+						xcb_dri2_wait_msc(c, win,
+							upper_32_bits(msc),
+							lower_32_bits(msc),
+							0, 1, 0, 0).sequence);
+				msc += divisors[n];
+			}
+			XFlush(dpy);
+			XDestroyWindow(mgr, win);
+			XFlush(mgr);
+			printf("."); fflush(stdout);
+		} while (--loop);
+		printf("*\n");
+	}
 
 	XSync(dpy, 1);
 	XSync(mgr, 1);
@@ -441,7 +310,7 @@ static void race_client(int width, int height,
 			const char *name)
 {
 	XSetWindowAttributes attr;
-	int count, loop;
+	int count, loop, n;
 
 	printf("%s(%s)\n", __func__, name);
 
@@ -449,108 +318,95 @@ static void race_client(int width, int height,
 	 * can guarantee we do not get clipped by children.
 	 */
 	attr.override_redirect = 1;
-	loop = 100;
-	do {
-		Display *dpy = XOpenDisplay(NULL);
-		Window win = XCreateWindow(dpy, DefaultRootWindow(dpy),
-					   0, 0, width, height, 0,
-					   DefaultDepth(dpy, DefaultScreen(dpy)),
-					   InputOutput,
-					   DefaultVisual(dpy, DefaultScreen(dpy)),
-					   CWOverrideRedirect, &attr);
-
-		XMapWindow(dpy, win);
-
-		DRI2CreateDrawable(dpy, win);
-		free(DRI2GetBuffers(dpy, win, &width, &height,
-				    attachments, nattachments, &count));
-		if (count != nattachments)
-			return;
-
-		for (count = 0; count < loop; count++)
-			DRI2SwapBuffers(dpy, win, 0, 0, 0);
-		XCloseDisplay(dpy);
-		printf("."); fflush(stdout);
-	} while (--loop);
-	printf("*\n");
-
-	loop = 100;
-	do {
-		Display *dpy = XOpenDisplay(NULL);
-		Window win = XCreateWindow(dpy, DefaultRootWindow(dpy),
-					   0, 0, width, height, 0,
-					   DefaultDepth(dpy, DefaultScreen(dpy)),
-					   InputOutput,
-					   DefaultVisual(dpy, DefaultScreen(dpy)),
-					   CWOverrideRedirect, &attr);
-
-		XMapWindow(dpy, win);
-
-		DRI2CreateDrawable(dpy, win);
-		free(DRI2GetBuffers(dpy, win, &width, &height,
-				    attachments, nattachments, &count));
-		if (count != nattachments)
-			return;
-
-		for (count = 0; count < loop; count++)
-			swap_buffers(dpy, win, 0, attachments, nattachments);
-		XCloseDisplay(dpy);
-		printf("."); fflush(stdout);
-	} while (--loop);
-	printf("*\n");
-
-	loop = 100;
-	do {
-		Display *dpy = XOpenDisplay(NULL);
-		Window win = XCreateWindow(dpy, DefaultRootWindow(dpy),
-					   0, 0, width, height, 0,
-					   DefaultDepth(dpy, DefaultScreen(dpy)),
-					   InputOutput,
-					   DefaultVisual(dpy, DefaultScreen(dpy)),
-					   CWOverrideRedirect, &attr);
-
-		XMapWindow(dpy, win);
-
-		DRI2CreateDrawable(dpy, win);
-		free(DRI2GetBuffers(dpy, win, &width, &height,
-				    attachments, nattachments, &count));
-		if (count != nattachments)
-			return;
-
-		for (count = 0; count < loop; count++)
-			swap_buffers(dpy, win, 1, attachments, nattachments);
-		XCloseDisplay(dpy);
-		printf("."); fflush(stdout);
-	} while (--loop);
-	printf("*\n");
-
-	loop = 100;
-	do {
-		uint64_t ignore, msc;
-		Display *dpy = XOpenDisplay(NULL);
-		xcb_connection_t *c = XGetXCBConnection(dpy);
-		Window win = XCreateWindow(dpy, DefaultRootWindow(dpy),
-					   0, 0, width, height, 0,
-					   DefaultDepth(dpy, DefaultScreen(dpy)),
-					   InputOutput,
-					   DefaultVisual(dpy, DefaultScreen(dpy)),
-					   CWOverrideRedirect, &attr);
-
-		XMapWindow(dpy, win);
-
-		DRI2CreateDrawable(dpy, win);
-		DRI2GetMSC(dpy, win, &ignore, &msc, &ignore);
-		for (count = 0; count < loop; count++)
-			xcb_discard_reply(c,
-					  xcb_dri2_wait_msc(c, win,
-							    upper_32_bits(msc + count + 1),
-							    lower_32_bits(msc + count + 1),
-							    0, 1, 0, 0).sequence);
-		XFlush(dpy);
-		XCloseDisplay(dpy);
-		printf("."); fflush(stdout);
-	} while (--loop);
-	printf("*\n");
+	for (n = 0; n < N_DIVISORS; n++) {
+		printf("DRI2SwapBuffers(divisor=%d)", divisors[n]);
+		loop = 100;
+		do {
+			Display *dpy = XOpenDisplay(NULL);
+			Window win = XCreateWindow(dpy, DefaultRootWindow(dpy),
+					0, 0, width, height, 0,
+					DefaultDepth(dpy, DefaultScreen(dpy)),
+					InputOutput,
+					DefaultVisual(dpy, DefaultScreen(dpy)),
+					CWOverrideRedirect, &attr);
+
+			XMapWindow(dpy, win);
+
+			DRI2CreateDrawable(dpy, win);
+			free(DRI2GetBuffers(dpy, win, &width, &height,
+						attachments, nattachments, &count));
+			if (count != nattachments)
+				return;
+
+			for (count = 0; count < loop; count++)
+				DRI2SwapBuffers(dpy, win, 0, divisors[n], count & (divisors[n]-1));
+			XCloseDisplay(dpy);
+			printf("."); fflush(stdout);
+		} while (--loop);
+		printf("*\n");
+	}
+
+	for (n = 0; n < N_DIVISORS; n++) {
+		printf("xcb_dri2_swap_buffers(divisor=%d)", divisors[n]);
+		loop = 100;
+		do {
+			Display *dpy = XOpenDisplay(NULL);
+			Window win = XCreateWindow(dpy, DefaultRootWindow(dpy),
+					0, 0, width, height, 0,
+					DefaultDepth(dpy, DefaultScreen(dpy)),
+					InputOutput,
+					DefaultVisual(dpy, DefaultScreen(dpy)),
+					CWOverrideRedirect, &attr);
+
+			XMapWindow(dpy, win);
+
+			DRI2CreateDrawable(dpy, win);
+			free(DRI2GetBuffers(dpy, win, &width, &height,
+						attachments, nattachments, &count));
+			if (count != nattachments)
+				return;
+
+			for (count = 0; count < loop; count++)
+				swap_buffers(dpy, win, divisors[n], attachments, nattachments);
+			XCloseDisplay(dpy);
+			printf("."); fflush(stdout);
+		} while (--loop);
+		printf("*\n");
+	}
+
+	for (n = 0; n < N_DIVISORS; n++) {
+		printf("DRI2WaitMsc(divisor=%d)", divisors[n]);
+		loop = 100;
+		do {
+			uint64_t ignore, msc;
+			Display *dpy = XOpenDisplay(NULL);
+			xcb_connection_t *c = XGetXCBConnection(dpy);
+			Window win = XCreateWindow(dpy, DefaultRootWindow(dpy),
+					0, 0, width, height, 0,
+					DefaultDepth(dpy, DefaultScreen(dpy)),
+					InputOutput,
+					DefaultVisual(dpy, DefaultScreen(dpy)),
+					CWOverrideRedirect, &attr);
+
+			XMapWindow(dpy, win);
+
+			DRI2CreateDrawable(dpy, win);
+			DRI2GetMSC(dpy, win, &ignore, &msc, &ignore);
+			msc++;
+			for (count = 0; count < loop; count++) {
+				xcb_discard_reply(c,
+						xcb_dri2_wait_msc(c, win,
+							upper_32_bits(msc),
+							lower_32_bits(msc),
+							0, 1, 0, 0).sequence);
+				msc += divisors[n];
+			}
+			XFlush(dpy);
+			XCloseDisplay(dpy);
+			printf("."); fflush(stdout);
+		} while (--loop);
+		printf("*\n");
+	}
 }
 
 int main(void)