d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Make sigaltstack as per-threaded, because per-process sigaltstack state

Browse Source 
is useless for threaded programs, multiple threads can not share same
stack.
The alternative signal stack is private for thread, no lock is needed,
the orignal P_ALTSTACK is now moved into td_pflags and renamed to
TDP_ALTSTACK.
For single thread or Linux clone() based threaded program, there is no
semantic changed, because those programs only have one kernel thread
in every process.
This commit is contained in:
David Xu 2004-01-03 23:36:31 +00:00
parent 9b778a1611
commit 51362c2d8a
1 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
sys/alpha/osf1/osf1_signal.c
View File

@ -485,11 +485,11 @@ osf1_sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
* and the useracc() check will fail if the process has not already
* allocated the space with a `brk'.
*/
if ((p->p_flag & P_ALTSTACK) && !oonstack &&
if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
SIGISMEMBER(psp->ps_sigonstack, sig)) {
sip = (osiginfo_t *)((caddr_t)p->p_sigstk.ss_sp +
p->p_sigstk.ss_size - rndfsize);
p->p_sigstk.ss_flags |= SS_ONSTACK;
sip = (osiginfo_t *)((caddr_t)td->td_sigstk.ss_sp +
td->td_sigstk.ss_size - rndfsize);
td->td_sigstk.ss_flags |= SS_ONSTACK;
} else
sip = (osiginfo_t *)(alpha_pal_rdusp() - rndfsize);
mtx_unlock(&psp->ps_mtx);
@ -588,9 +588,9 @@ osf1_sigreturn(struct thread *td,
*/
PROC_LOCK(p);
if (ksc.sc_onstack)
p->p_sigstk.ss_flags |= SS_ONSTACK;
td->td_sigstk.ss_flags |= SS_ONSTACK;
else
p->p_sigstk.ss_flags &= ~SS_ONSTACK;
td->td_sigstk.ss_flags &= ~SS_ONSTACK;
/*
* longjmp is still implemented by calling osigreturn. The new