Hi there,
the following shows a problem in Cygwin 1.7 that is
not present in Cygwin 1.5:
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$ cat bug.c
#include <sys/time.h>
#include <time.h>
#include <signal.h>
#include <stdio.h>
volatile int alarm_called = 0;
void alarm(int sig) {
alarm_called = 1;
}
int main() {
unsigned long i;
struct itimerval it;
it.it_interval.tv_sec = 0;
it.it_interval.tv_usec = 0;
/* 100,000 microseconds. */
it.it_value = (struct timeval) { 0, 100000 };
signal(SIGALRM, alarm);
setitimer(ITIMER_REAL, &it, (struct itimerval *) 0);
for (i = 0; i <= 2000000000; ++i)
if (alarm_called)
break;
if (alarm_called)
printf("alarm() called\n");
else
printf("alarm() NOT called\n");
return 0;
}
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$ gcc -v
Reading specs from /usr/lib/gcc/i686-pc-cygwin/3.4.4/specs
Configured with: /usr/build/package/orig/test.respin/gcc-3.4.4-3/configure
--verbose --prefix=/usr --exec-prefix=/usr --sysconfdir=/etc --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info
--enable-languages=c,ada,c++,d,f77,pascal,java,objc --enable-nls
--without-included-gettext --enable-version-specific-runtime-libs --without-x
--enable-libgcj --disable-java-awt --with-system-zlib --enable-interpreter
--disable-libgcj-debug --enable-threads=posix --enable-java-gc=boehm
--disable-win32-registry --enable-sjlj-exceptions --enable-hash-synchronization
--enable-libstdcxx-debug
Thread model: posix
gcc version 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)
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$ gcc bug.c
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$ time ./a.exe
alarm() NOT called
real 0m7.203s
user 0m7.201s
sys 0m0.015s
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$
As you see, the alarm() function is not invoked as it should
(and as it is in Cygwin 1.5).
All the best,
Roberto
--
Prof. Roberto Bagnara
Computer Science Group
Department of Mathematics, University of Parma, Italy
http://www.cs.unipr.it/~bagnara/
mailto:[EMAIL PROTECTED]
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