Update mallocx() OOM test to deal with smaller hugemax.

Depending on virtual memory resource limits, it is necessary to attempt
allocating three maximally sized objects to trigger OOM rather than just
two, since the maximum supported size is slightly less than half the
total virtual memory address space.

This fixes a test failure that was introduced by
0c516a00c4cb28cff55ce0995f756b5aae074c9e (Make *allocx() size class
overflow behavior defined.).

This resolves #379.

1 files changed, 19 insertions, 10 deletions

diff --git a/test/integration/mallocx.c b/test/integration/mallocx.c
index d82bf42..578c229 100644
--- a/test/integration/mallocx.c
+++ b/test/integration/mallocx.c
@@ -69,19 +69,28 @@ TEST_END
 
 TEST_BEGIN(test_oom)
 {
+	size_t hugemax;
+	bool oom;
+	void *ptrs[3];
+	unsigned i;
 
 	/*
-	 * It should be impossible to allocate two objects that each consume
-	 * more than half the virtual address space.
+	 * It should be impossible to allocate three objects that each consume
+	 * nearly half the virtual address space.
 	 */
-	{
-		size_t hugemax = get_huge_size(get_nhuge()-1);
-		void *p = mallocx(hugemax, 0);
-		if (p != NULL) {
-			assert_ptr_null(mallocx(hugemax, 0),
-			    "Expected OOM for mallocx(size=%#zx, 0)", hugemax);
-			dallocx(p, 0);
-		}
+	hugemax = get_huge_size(get_nhuge()-1);
+	oom = false;
+	for (i = 0; i < sizeof(ptrs) / sizeof(void *); i++) {
+		ptrs[i] = mallocx(hugemax, 0);
+		if (ptrs[i] == NULL)
+			oom = true;
+	}
+	assert_true(oom,
+	    "Expected OOM during series of calls to mallocx(size=%zu, 0)",
+	    hugemax);
+	for (i = 0; i < sizeof(ptrs) / sizeof(void *); i++) {
+		if (ptrs[i] != NULL)
+			dallocx(ptrs[i], 0);
 	}
 
 #if LG_SIZEOF_PTR == 3