Index: db-4.2.52/dbinc/mutex.h
===================================================================
--- db-4.2.52.orig/dbinc/mutex.h	2007-07-28 18:12:36.000000000 +0000
+++ db-4.2.52/dbinc/mutex.h	2007-07-28 18:17:09.000000000 +0000
@@ -527,6 +527,46 @@
 #endif
 
 /*********************************************************************
+ * MIPS/gcc assembly.
+ *********************************************************************/
+#ifdef HAVE_MUTEX_MIPS_GCC_ASSEMBLY
+typedef u_int32_t tsl_t;
+
+#ifndef        MUTEX_ALIGN
+#define        MUTEX_ALIGN     4
+#endif
+
+#ifdef LOAD_ACTUAL_MUTEX_CODE
+/*
+ * For gcc/mips.  Should return 0 if could not acquire the lock, 1 if
+ * lock was acquired properly.
+ */
+static inline int
+MUTEX_SET(tsl_t *tsl) {
+       register tsl_t *__l = tsl;
+       register tsl_t __r;
+       __asm__ __volatile__(
+               "       .set push       \n"
+               "       .set mips2      \n"
+               "       .set noreorder  \n"
+               "       .set nomacro    \n"
+               "1:     ll      %0, %1          \n"
+               "       bne     %0, $0, 1f      \n"
+               "        xori   %0, %0, 1       \n"
+               "       sc      %0, %1          \n"
+               "       beql    %0, $0, 1b      \n"
+               "        xori   %0, 1           \n"
+               "1:     .set pop                  "
+               : "=&r" (__r), "+R" (*__l));
+       return __r;
+}
+
+#define        MUTEX_UNSET(tsl)        (*(volatile tsl_t *)(tsl) = 0)
+#define        MUTEX_INIT(tsl)         MUTEX_UNSET(tsl)
+#endif
+#endif
+
+/*********************************************************************
  * HPPA/gcc assembly.
  *********************************************************************/
 #ifdef HAVE_MUTEX_HPPA_GCC_ASSEMBLY
Index: db-4.2.52/dist/config.hin
===================================================================
--- db-4.2.52.orig/dist/config.hin	2003-12-03 21:10:00.000000000 +0000
+++ db-4.2.52/dist/config.hin	2007-07-28 18:17:09.000000000 +0000
@@ -122,6 +122,9 @@
 /* Define to 1 to use the GCC compiler and IA64 assembly language mutexes. */
 #undef HAVE_MUTEX_IA64_GCC_ASSEMBLY
 
+/* Define to 1 to use the GCC compiler and MIPS assembly language mutexes. */
+#undef HAVE_MUTEX_MIPS_GCC_ASSEMBLY
+
 /* Define to 1 to use the msem_XXX mutexes on systems other than HP-UX. */
 #undef HAVE_MUTEX_MSEM_INIT
 
Index: db-4.2.52/dist/aclocal/mutex.ac
===================================================================
--- db-4.2.52.orig/dist/aclocal/mutex.ac	2007-07-28 18:12:36.000000000 +0000
+++ db-4.2.52/dist/aclocal/mutex.ac	2007-07-28 18:17:09.000000000 +0000
@@ -376,6 +376,17 @@
 ], [db_cv_mutex="ARM/gcc-assembly"])
 fi
 
+# MIPS/gcc: Linux
+if test "$db_cv_mutex" = no; then
+AC_TRY_COMPILE(,[
+#if (defined(__mips) || defined(__mips__)) && defined(__GNUC__)
+       exit(0);
+#else
+       FAIL TO COMPILE/LINK
+#endif
+], [db_cv_mutex="MIPS/gcc-assembly"])
+fi
+
 # PaRisc/gcc: HP/UX
 if test "$db_cv_mutex" = no; then
 AC_TRY_COMPILE(,[
@@ -513,6 +524,10 @@
 			AC_DEFINE(HAVE_MUTEX_ARM_GCC_ASSEMBLY)
 			AH_TEMPLATE(HAVE_MUTEX_ARM_GCC_ASSEMBLY,
 			    [Define to 1 to use the GCC compiler and ARM assembly language mutexes.]);;
+MIPS/gcc-assembly)	ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
+			AC_DEFINE(HAVE_MUTEX_MIPS_GCC_ASSEMBLY)
+			AH_TEMPLATE(HAVE_MUTEX_MIPS_GCC_ASSEMBLY,
+			    [Define to 1 to use the GCC compiler and MIPS assembly language mutexes.]);;
 HP/msem_init)		ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
 			AC_DEFINE(HAVE_MUTEX_HPPA_MSEM_INIT)
 			AH_TEMPLATE(HAVE_MUTEX_HPPA_MSEM_INIT,