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Date: | Mon, 25 Feb 2019 13:26:04 +0100 |
From: | Corinna Vinschen <corinna-cygwin AT cygwin DOT com> |
To: | cygwin AT cygwin DOT com |
Subject: | Re: problem with mmap and fork() |
Message-ID: | <20190225122604.GI4133@calimero.vinschen.de> |
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--MGu/vTNewDGZ7tmp Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Feb 25 11:51, Houder wrote: > On Sat, 23 Feb 2019 05:54:18, Doug Henderson wrote: >=20 > > On Fri, 22 Feb 2019 at 17:01, Glyn Gowing <> wrote: > > > I have a program (attached) that works correctly on my mac but does > > > not work with Cygwin on Windows 10. I'm running the latest version of > [snip] >=20 > > On further analysis, the call to > > > pthread_mutexattr_setpshared(attr, PTHREAD_PROCESS_SHARED); > > is failing. The error is EINVAL (22) Invalid argument. > >=20 > > This suggests that pthread mutexes cannot be shared between processes > > by using shared memory in cygwin. I have not attempted to determine if > > this is working as expected, or if this is a bug, or a limitation in > > the Windows environment. >=20 > For the record, this (i.c. PTHREAD_PROCESS_SHARED) is not yet supported on > Cygwin. >=20 > winsup/cygwin/thread.cc >=20 > 3636 extern "C" int > 3637 pthread_mutexattr_setpshared (pthread_mutexattr_t *attr, int pshared) > 3638 { > 3639 if (!pthread_mutexattr::is_good_object (attr)) > 3640 return EINVAL; > 3641 /* we don't use pshared for anything as yet. We need to test PROCE= SS_SHARED > 3642 *functionality > 3643 */ > 3644 if (pshared !=3D PTHREAD_PROCESS_PRIVATE) > 3645 return EINVAL; <=3D=3D=3D=3D > 3646 (*attr)->pshared =3D pshared; > 3647 return 0; > 3648 } >=20 > Henri Needless to say that patches in this area are welcome, I guess. Corinna --=20 Corinna Vinschen Cygwin Maintainer --MGu/vTNewDGZ7tmp Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEoVYPmneWZnwT6kwF9TYGna5ET6AFAlxz3twACgkQ9TYGna5E T6AoNxAAosqOuLjQtdwqR+fZRn9Vyp62qdFmUQosHfp5iYfM1fi3Srfy3xZWkyEi WnlrLhdfDzJZF7FhIrD/K+JIB2FO3bG1cETREWXPFiUaOjkirJQB0Ipa5e4miDr9 6Xb5podR+yED0cmu6exJi82kinhDVa/DG8NriJ07QXzfDRm9U6dpsOAmcUPlqrqA LdMjDMMoFD7SOGaVp3/mjX7cUc5tYjadnFyxbBv6NyDPmVVjVd6BxpiipNV66Pvk aaOnqipMEEh1uZFCWhKvZW5OHmEg9UbfR7GZxJSArXU4KLDyDwMg+nZ7zsA8flUc P71V20/eiCnp5rR4RwElXCgwH1CrbUKuvkNHeFkXuASyxTMOWRPrLxc3lRq/Yjhj tM+fAadmCJKYsRP9vTKavOrDqPA2BKP0EtWO4Q881t6p2vAXFu56Mn1nEkgQWKDb KhsVas17b8V4c4r0heawu6XMciVwgY0wazppkUeT4iZPkakEpp6CyJ5AWKlQ1aMu PCgfTVvKFAEXlqu5RgLNsiR0u/VGDKvPC2mJSpM4svxyUt1/wHAgwZLz+dcR9RBr bDudXT64WFdBaK+BESpGgNf+5A5yLHKGdOrY2zOc4X82kj8Y0ajo+Qo5qZYS+QMM Bf+1SctkXCdCjg5SDxbUtGNDIS+Du2wbjypWniDYNcBSCpJsXMo= =gfbT -----END PGP SIGNATURE----- --MGu/vTNewDGZ7tmp--
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