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(unw): Initialize "lock" member. Switch to ANSI99-style initializers.

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(ia64_init): Use unw.lock to protect against races during
	initialization.  Disable signal delivery during initialization
	to ensure thread-safety (e.g., unw_init_local() may call
	ia64_init() and the former must be thread-safe).

(Logical change 1.111)
This commit is contained in:
hp.com!davidm 2003-11-19 03:11:25 +00:00
parent 3cc1ec6be9
commit 8e71bb0ab2
1 changed files with 54 additions and 39 deletions
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23
src/ia64/global-ia64.c
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@ -27,14 +27,15 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
struct ia64_global_unwind_state unw =
{
needs_initialization: 1,
save_order: {
.needs_initialization = 1,
.lock = PTHREAD_MUTEX_INITIALIZER,
.save_order = {
IA64_REG_IP, IA64_REG_PFS, IA64_REG_PSP, IA64_REG_PR,
IA64_REG_UNAT, IA64_REG_LC, IA64_REG_FPSR, IA64_REG_PRI_UNAT_GR
},
#if UNW_DEBUG
debug_level: 0,
preg_name: {
.debug_level = 0,
.preg_name = {
"pri_unat_gr", "pri_unat_mem", "psp", "bsp", "bspstore",
"ar.pfs", "ar.rnat", "rp",
"r4", "r5", "r6", "r7",
@ -73,9 +74,19 @@ ia64_init (void)
0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xfe,
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
sigset_t saved_sigmask;
uint8_t *lep, *bep;
long i;
sigprocmask (SIG_SETMASK, &unwi_full_sigmask, &saved_sigmask);
mutex_lock (&unw.lock);
{
if (!unw.needs_initialization)
/* another thread else beat us to it... */
goto out;
unw.needs_initialization = 0;
mi_init ();
mempool_init (&unw.reg_state_pool, sizeof (struct ia64_reg_state), 0);
@ -122,4 +133,8 @@ ia64_init (void)
}
# endif
#endif
}
out:
mutex_unlock (&unw.lock);
sigprocmask (SIG_SETMASK, &saved_sigmask, NULL);
}