mysql-gcc3.patch

   1 --- mysql-5.0.81/innobase/include/sync0rw.h~    2009-05-26 00:35:13.000000000 +0300
   2 +++ mysql-5.0.81/innobase/include/sync0rw.h     2009-06-16 19:09:27.587270045 +0300
   3 @@ -421,12 +421,6 @@
   4  #ifdef HAVE_ATOMIC_BUILTINS
   5  /* This value means NOT_LOCKED */
   6  #define RW_LOCK_BIAS           0x00100000
   7 -#else
   8 -#error HAVE_ATOMIC_BUILTINS is not defined. Do you use enough new GCC or compatibles?
   9 -#error Or do you use exact options for CFLAGS?
  10 -#error e.g. (for x86_32): "-m32 -march=i586 -mtune=i686"
  11 -#error e.g. (for Sparc_64): "-m64 -mcpu=v9"
  12 -#error Otherwise, this build may be slower than normal version.
  13  #endif
  14
  15  /* NOTE! The structure appears here only for the compiler to know its size.
  16
  17
  18
  19 NOTE: this chunk is to fix buggy percona patch:
  20 --- mysql-5.0.83/innobase/sync/sync0rw.c~       2009-07-16 12:43:34.863559101 +0300
  21 +++ mysql-5.0.83/innobase/sync/sync0rw.c        2009-07-16 13:01:55.553904932 +0300
  22 @@ -626,10 +626,14 @@
  23         } else if (state == RW_LOCK_NOT_LOCKED) {
  24
  25                 /* Spin waiting for the writer field to become free */
  26 -
  27 +#ifdef  HAVE_ATOMIC_BUILTINS
  28                 while (i < SYNC_SPIN_ROUNDS
  29                         && lock->lock_word != RW_LOCK_BIAS) {
  30 -                       if (srv_spin_wait_delay) {
  31 +#else
  32 +                               while (rw_lock_get_writer(lock) != RW_LOCK_NOT_LOCKED
  33 +                                               && i < SYNC_SPIN_ROUNDS) {
  34 +#endif
  35 +                               if (srv_spin_wait_delay) {
  36                                 ut_delay(ut_rnd_interval(0,
  37                                                         srv_spin_wait_delay));
  38                         }