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From: | Paolo Bonzini |
Subject: | [Qemu-devel] Re: [PATCH] qemu: work around for "posix-aio-compat" |
Date: | Wed, 21 Oct 2009 20:38:14 +0200 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.4pre) Gecko/20091014 Fedora/3.0-2.8.b4.fc11 Lightning/1.0pre Thunderbird/3.0b4 |
At every word of the sigset (using gdb commands to disable/enable the watchpoints around the sigfillset, you avoid spurious triggers).Not sure how do you mean. When would I enable the watchpoint?
301 static void *aio_thread(void *unused) 302 { 303 pid_t pid; 304 static sigset_t set; 305 306 /* block all signals */ ... 312 if (sigfillset(&set)) die("sigfillset"); .... 315 pid = getpid(); 316 317 while (1) { b 312 // sets bp 1 p ((long *)&set // prints $1 watch $1[0] // sets bp 2..9 watch $1[1] watch $1[2] watch $1[3] watch $1[4] watch $1[5] watch $1[6] watch $1[7] // only 1/4 of the sigset! // stop earlier if it starts // assigning non-hardware watchpoints // try again with 8..15 if not enough // up to $1[31] commands 1 // don't break on next sigfillset dis 2 dis 3 dis 4 dis 5 dis 6 dis 7 dis 8 dis 9 c // and continue end b 315 // sets bp 10 commands 10 // re-enable after sigfillset ena 2 ena 3 ena 4 ena 5 ena 6 ena 7 ena 8 ena 9 c // run body of aio_thread end c // run into aio_thread Paolo
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