diff options
Diffstat (limited to 'db2/mutex/sparc.gcc')
| -rw-r--r-- | db2/mutex/sparc.gcc | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/db2/mutex/sparc.gcc b/db2/mutex/sparc.gcc index 8445a0629b..9e3239b0b0 100644 --- a/db2/mutex/sparc.gcc +++ b/db2/mutex/sparc.gcc @@ -13,21 +13,19 @@ * For gcc/sparc, 0 is clear, 1 is set. */ -#if defined(__sparcv9__) -Does the following code need membar instructions for V9 processors? -#endif +/* The stbar is needed for v8, and is implemented as membar #sync on v9, + so is functional there as well. For v7, stbar may generate an illegal + instruction and we have no way to tell what we're running on. Some + operating systems notice and skip this instruction in the fault handler. */ #define TSL_SET(tsl) ({ \ register tsl_t *__l = (tsl); \ register tsl_t __r; \ __asm__ volatile \ - ("ldstub [%1],%0" \ + ("ldstub [%1],%0; stbar" \ : "=r"( __r) : "r" (__l)); \ !__r; \ }) -#define TSL_UNSET(tsl) ({ \ - register tsl_t *__l = (tsl); \ - __asm__ volatile ("stb %%g0,[%0]" : : "r" (__l)); \ -}) +#define TSL_UNSET(tsl) ((tsl) = 0) #define TSL_INIT(tsl) TSL_UNSET(tsl) |