From: Jeremy Fitzhardinge <jeremy@valgrind.org>
Date: Tue, 16 Mar 2004 22:07:12 +0000 (+0000)
Subject: Init the per-thread sigaltstacks properly.  New threads should always
X-Git-Tag: svn/VALGRIND_2_1_2~174
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=77403e63a0bf55d260018cda51b119974ce14fea;p=thirdparty%2Fvalgrind.git

Init the per-thread sigaltstacks properly.  New threads should always
appear without a sigaltstack.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@2331
---

diff --git a/coregrind/vg_scheduler.c b/coregrind/vg_scheduler.c
index dd604da8c4..0ec739c4c3 100644
--- a/coregrind/vg_scheduler.c
+++ b/coregrind/vg_scheduler.c
@@ -574,6 +574,11 @@ void mostly_clear_thread_record ( ThreadId tid )
    VG_(threads)[tid].sys_pre_res	  = NULL;
 
    VG_(threads)[tid].proxy		  = NULL;
+
+   /* start with no altstack */
+   VG_(threads)[tid].altstack.ss_sp = (void *)0xdeadbeef;
+   VG_(threads)[tid].altstack.ss_size = 0;
+   VG_(threads)[tid].altstack.ss_flags = VKI_SS_DISABLE;
 }
 
 
diff --git a/coregrind/vg_signals.c b/coregrind/vg_signals.c
index 08a355feba..b178bebc7b 100644
--- a/coregrind/vg_signals.c
+++ b/coregrind/vg_signals.c
@@ -2391,10 +2391,6 @@ void VG_(sigstartup_actions) ( void )
    vg_scss.scss_per_sig[VKI_SIGVGKILL].scss_flags = VKI_SA_SIGINFO;
    VG_(ksigfillset)(&vg_scss.scss_per_sig[VKI_SIGVGKILL].scss_mask);
 
-   /* Copy the alt stack, if any. */
-   ret = VG_(ksigaltstack)(NULL, &VG_(threads)[1].altstack);
-   vg_assert(ret == 0);
-
    /* Copy the process' signal mask into the root thread. */
    vg_assert(VG_(threads)[1].status == VgTs_Runnable);
    VG_(threads)[1].sig_mask = saved_procmask;