diff --git a/lib/isc/include/isc/mem.h b/lib/isc/include/isc/mem.h
index 2aee5fb00c..4c50bfaf35 100644
--- a/lib/isc/include/isc/mem.h
+++ b/lib/isc/include/isc/mem.h
@@ -604,6 +604,27 @@ char *ISCMEMFUNC(strndup)(isc_mem_t *, const char *, size_t _ISC_MEM_FLARG);
 void *ISCMEMPOOLFUNC(get)(isc_mempool_t *_ISC_MEM_FLARG);
 void  ISCMEMPOOLFUNC(put)(isc_mempool_t *, void *_ISC_MEM_FLARG);
 
+/*
+ * Memory management routines using default memory context
+ */
+
+#define isc_malloc(size)       isc__malloc((size)_ISC_MEM_FILELINE)
+#define isc_calloc(num, size)  isc__calloc((num), (size)_ISC_MEM_FILELINE)
+#define isc_realloc(ptr, size) isc__realloc((ptr), (size)_ISC_MEM_FILELINE)
+#define isc_free(ptr)	       isc__free((ptr)_ISC_MEM_FILELINE)
+#define isc_strdup(str)	       isc__strdup((str)_ISC_MEM_FILELINE)
+
+void *
+isc__malloc(size_t size _ISC_MEM_FLARG);
+void *
+isc__calloc(size_t num, size_t size _ISC_MEM_FLARG);
+void *
+isc__realloc(void *ptr, size_t size _ISC_MEM_FLARG);
+void
+isc__free(void *ptr _ISC_MEM_FLARG);
+char *
+isc__strdup(const char *str _ISC_MEM_FLARG);
+
 ISC_LANG_ENDDECLS
 
 #endif /* ISC_MEM_H */
diff --git a/lib/isc/include/isc/util.h b/lib/isc/include/isc/util.h
index 8941ec125e..b88cc51aff 100644
--- a/lib/isc/include/isc/util.h
+++ b/lib/isc/include/isc/util.h
@@ -48,6 +48,14 @@
 #define ISC_NONSTRING
 #endif /* __GNUC__ */
 
+#if __GNUC__
+#define ISC_CONSTRUCTOR(priority) __attribute__((constructor(priority)))
+#define ISC_DESTRUCTOR(priority)  __attribute__((destructor(priority)))
+#else
+#define ISC_CONSTRUCTOR(priority)
+#define ISC_DESTRUCTOR(priority)
+#endif
+
 /*%
  * The opposite: silent warnings about stored values which are never read.
  */
@@ -340,6 +348,15 @@ mock_assert(const int result, const char *const expression,
 #define ISC_ALIGN(x, a) (((x) + (a)-1) & ~((uintmax_t)(a)-1))
 #endif /* ifdef __GNUC__ */
 
+/*%
+ * Overflow checks
+ */
+#if __has_builtin(__builtin_add_overflow) || __GNUC__ >= 5
+#define ISC_MUL_OVERFLOW(a, b, res) __builtin_mul_overflow(a, b, res)
+#else
+#define ISC_MUL_OVERFLOW(a, b, res) ((*res) = (a) * (b))
+#endif
+
 /*%
  * Misc
  */
diff --git a/lib/isc/mem.c b/lib/isc/mem.c
index 879b6232f9..1afea66d66 100644
--- a/lib/isc/mem.c
+++ b/lib/isc/mem.c
@@ -2520,3 +2520,60 @@ isc__mem_printactive(isc_mem_t *ctx0, FILE *file) {
 	UNUSED(file);
 #endif /* if ISC_MEM_TRACKLINES */
 }
+
+/*
+ * Routines using default memory context
+ */
+
+static isc_mem_t *isc__mem_mctx = NULL;
+
+void
+isc__mem_initialize(void);
+void
+isc__mem_shutdown(void);
+
+ISC_CONSTRUCTOR(101)
+void
+isc__mem_initialize(void) {
+	REQUIRE(isc__mem_mctx == NULL);
+	isc_mem_create(&isc__mem_mctx);
+	isc_mem_setname(isc__mem_mctx, "default", NULL);
+}
+
+ISC_DESTRUCTOR(101)
+void
+isc__mem_shutdown(void) {
+	REQUIRE(isc__mem_mctx != NULL);
+	isc_mem_destroy(&isc__mem_mctx);
+	isc_mem_checkdestroyed(stderr);
+}
+
+void *
+isc__malloc(size_t size FLARG) {
+	return (isc__mem_allocate(isc__mem_mctx, size FLARG_PASS));
+}
+
+void *
+isc__calloc(size_t num, size_t size FLARG) {
+	size_t numsize;
+
+	ISC_MUL_OVERFLOW(num, size, &numsize);
+	void *ptr = isc__mem_allocate(isc__mem_mctx, numsize FLARG_PASS);
+	memset(ptr, 0, numsize);
+	return (ptr);
+}
+
+void *
+isc__realloc(void *ptr, size_t size FLARG) {
+	return (isc__mem_reallocate(isc__mem_mctx, ptr, size FLARG_PASS));
+}
+
+void
+isc__free(void *ptr FLARG) {
+	isc__mem_free(isc__mem_mctx, ptr FLARG_PASS);
+}
+
+char *
+isc__strdup(const char *s1 FLARG) {
+	return (isc__mem_strdup(isc__mem_mctx, s1 FLARG_PASS));
+}
diff --git a/lib/isc/win32/DLLMain.c b/lib/isc/win32/DLLMain.c
index 3acfee4f46..e6caeec346 100644
--- a/lib/isc/win32/DLLMain.c
+++ b/lib/isc/win32/DLLMain.c
@@ -12,6 +12,11 @@
 #include <stdio.h>
 #include <windows.h>
 
+void
+isc__mem_initialize(void);
+void
+isc__mem_shutdown(void);
+
 /*
  * Called when we enter the DLL
  */
@@ -27,6 +32,7 @@ __declspec(dllexport) BOOL WINAPI
 		 * Disable DllMain() invocation on Thread creation/destruction
 		 */
 		DisableThreadLibraryCalls(hinstDLL);
+		isc__mem_initialize(); /* priority=101 */
 		break;
 
 	/*
@@ -34,6 +40,7 @@ __declspec(dllexport) BOOL WINAPI
 	 * termination or a call to FreeLibrary.
 	 */
 	case DLL_PROCESS_DETACH:
+		isc__mem_shutdown(); /* priority=101 */
 		break;
 
 	case DLL_THREAD_ATTACH: