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From: "evijaykumar at yahoo dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/13684] New: local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads Date: Wed, 14 Jan 2004 17:25:00 -0000 [thread overview] Message-ID: <20040114172507.13684.evijaykumar@yahoo.com> (raw) I have a simple sample code which illustrates the issue. Basically, if multiple threads invoke a function which has local static object, the ctor and dtor are called multiple times on the same object in non reentrant manner until object is fully constructed. Here is a sample program which illustrates the issue #include <stdio.h> #include <unistd.h> #include <pthread.h> volatile int i; class A { public: int i; A(int i) { this->i = i; sleep(1); printf("I am in A ctor %d this:%p\n", i, this); } ~A() { printf("A dtor %d this:%p\n", i, this); } }; extern "C" void *foo(void *) { printf("before static ctor in foo\n"); static A a(i++); printf("in foo %p a(i) %d\n", &a, a.i); return NULL; } main() { printf("I am in main\n"); pthread_t tid; pthread_create(&tid,NULL, foo, NULL); pthread_create(&tid,NULL, foo, NULL); pthread_create(&tid,NULL, foo, NULL); pthread_create(&tid,NULL, foo, NULL); pthread_create(&tid,NULL, foo, NULL); pthread_create(&tid,NULL, foo, NULL); pthread_create(&tid,NULL, foo, NULL); pthread_create(&tid,NULL, foo, NULL); pthread_create(&tid,NULL, foo, NULL); pthread_create(&tid,NULL, foo, NULL); pthread_create(&tid,NULL, foo, NULL); sleep(3); foo(NULL); } The output of this program is I am in main before static ctor in foo before static ctor in foo before static ctor in foo before static ctor in foo before static ctor in foo before static ctor in foo before static ctor in foo before static ctor in foo before static ctor in foo before static ctor in foo before static ctor in foo I am in A ctor 1 this:210b0 I am in A ctor 3 this:210b0 in foo 210b0 a(i) 10 in foo 210b0 a(i) 10 I am in A ctor 4 this:210b0 in foo 210b0 a(i) 10 I am in A ctor 6 this:210b0 in foo 210b0 a(i) 10 I am in A ctor 8 this:210b0 in foo 210b0 a(i) 10 I am in A ctor 9 this:210b0 in foo 210b0 a(i) 10 I am in A ctor 2 this:210b0 in foo 210b0 a(i) 10 I am in A ctor 5 this:210b0 in foo 210b0 a(i) 10 I am in A ctor 0 this:210b0 in foo 210b0 a(i) 10 I am in A ctor 10 this:210b0 in foo 210b0 a(i) 10 I am in A ctor 7 this:210b0 in foo 210b0 a(i) 10 before static ctor in foo in foo 210b0 a(i) 10 A dtor 10 this:210b0 A dtor 10 this:210b0 A dtor 10 this:210b0 A dtor 10 this:210b0 A dtor 10 this:210b0 A dtor 10 this:210b0 A dtor 10 this:210b0 A dtor 10 this:210b0 A dtor 10 this:210b0 A dtor 10 this:210b0 A dtor 10 this:210b0 -- Summary: local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads Product: gcc Version: 3.3.3 Status: UNCONFIRMED Severity: normal Priority: P2 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: evijaykumar at yahoo dot com CC: gcc-bugs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13684
next reply other threads:[~2004-01-14 17:25 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top 2004-01-14 17:25 evijaykumar at yahoo dot com [this message] 2004-01-14 17:27 ` [Bug c++/13684] " evijaykumar at yahoo dot com 2004-01-14 17:30 ` pinskia at gcc dot gnu dot org 2004-01-14 17:32 ` pinskia at gcc dot gnu dot org 2004-01-14 20:55 ` evijaykumar at yahoo dot com 2004-07-15 1:07 ` pinskia at gcc dot gnu dot org 2004-07-15 2:16 ` gianni at mariani dot ws 2004-07-15 2:42 ` bangerth at dealii dot org 2004-07-15 5:11 ` gianni at mariani dot ws 2004-07-15 11:07 ` rmerkert at alphatech dot com 2004-07-15 13:54 ` gianni at mariani dot ws 2004-08-21 0:01 ` jason at gcc dot gnu dot org 2004-08-28 2:34 ` cvs-commit at gcc dot gnu dot org 2004-08-28 10:18 ` pinskia at gcc dot gnu dot org 2004-08-28 19:04 ` gianni at mariani dot ws 2004-08-31 6:41 ` adah at netstd dot com 2004-08-31 20:58 ` pinskia at gcc dot gnu dot org 2004-09-01 16:58 ` cvs-commit at gcc dot gnu dot org 2004-09-04 18:06 ` jason at redhat dot com 2004-09-05 3:19 ` adah at netstd dot com 2005-04-13 16:56 ` dhruvbird at yahoo dot com 2005-04-14 7:39 ` jason at redhat dot com 2005-04-18 9:07 ` adah at netstd dot com 2005-04-18 18:28 ` jason at redhat dot com
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