mirror of
https://github.com/Zenithsiz/ftmemsim-valgrind.git
synced 2026-02-04 02:18:37 +00:00
7a36f60133
for pthread_* support. Major changes:
* Valgrind now contains a (skeletal!) user-space pthreads
implementation. The exciting bits are in new file vg_scheduler.c.
This contains thread management and scheduling, including nasty crud
to do with making some syscalls (read,write,nanosleep) nonblocking.
Also implementation of pthread_ functions: create join
mutex_{create,destroy,lock,unlock} and cancel.
* As a side effect of the above, major improvements to signal handling
and to the client-request machinery. This is now used to intercept
malloc/free etc too; the hacky way this is done before is gone.
Another side effect is that vg_dispatch.S is greatly simplified.
Also, the horrible hacks to do with delivering signals to threads
blocked in syscalls are gone, since the new mechanisms cover this case
easily.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@52
33 lines
645 B
C
33 lines
645 B
C
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#include <stdio.h>
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#include <unistd.h>
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#include <assert.h>
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#include <signal.h>
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int fds[2];
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void the_sighandler ( int signo )
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{
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int nw;
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// assert(signo == SIGUSR1);
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printf("sighandler running; should unblock now\n");
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nw = write(fds[1], "zzz", 1);
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// assert(nw == 1);
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}
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int main ( void )
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{
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char buf[10];
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int res, nr;
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void* oldsh = signal(SIGUSR1, the_sighandler);
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assert(oldsh != SIG_ERR);
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printf("pid = %d\n", getpid());
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res = pipe(fds);
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assert (res == 0);
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printf("doing read(); this should block\n");
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nr = read(fds[0], buf, 1);
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/* blocks */
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printf("read returned %d\n", nr);
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return 0;
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}
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