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| From: | Doug Henderson <djndnbvg AT gmail DOT com> |
| Date: | Sat, 23 Feb 2019 05:54:18 -0700 |
| Message-ID: | <CAJ1FpuNG7a2nrK0A90VKuT9dAe5pf+aRbJzr65=cgQMxQ8rsuQ@mail.gmail.com> |
| Subject: | Re: problem with mmap and fork() |
| To: | cygwin <cygwin AT cygwin DOT com> |
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--00000000000066605b05828f35f7 Content-Type: text/plain; charset="UTF-8" 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 > What happens in the buggy execution is that the child obtains a lock > before the parent releases it. I'm using mmap and a pthread_mutex_t > object along with fork(). Again, this exact code works correctly on my > Mac running Mojave. On further analysis, the call to > pthread_mutexattr_setpshared(attr, PTHREAD_PROCESS_SHARED); is failing. The error is EINVAL (22) Invalid argument. 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. I have attached my files: smtest2.c - my heavily modified version of OP's original. smtest2.txt - output from running this version.showing error. smtest3.c - my version which uses 2 pthreads in a single process smtest3.txt - output from running this version, showing OP's expected results. HTH Doug --00000000000066605b05828f35f7 Content-Type: text/plain; charset="US-ASCII"; name="smtest2.txt" Content-Disposition: attachment; filename="smtest2.txt" Content-Transfer-Encoding: base64 Content-ID: <f_jshheykw1> X-Attachment-Id: f_jshheykw1 Z2NjIC1zdGQ9YzExIC1wdGhyZWFkIC1XYWxsIC1XZXh0cmEgLVdlcnJvciAt byBzbXRlc3QyIHNtdGVzdDIuYyAmJiAuL3NtdGVzdDIKMjIgSW52YWxpZCBh cmd1bWVudApwdGhyZWFkX211dGV4YXR0cl9zZXRwc2hhcmVkOiBObyBlcnJv cgptYWtlOiAqKiogW01ha2VmaWxlOjMwOiBzbXRlc3QyXSBFcnJvciAxCg== --00000000000066605b05828f35f7 Content-Type: application/octet-stream; name="smtest3.c" Content-Disposition: attachment; filename="smtest3.c" Content-Transfer-Encoding: base64 Content-ID: <f_jshheyl42> X-Attachment-Id: f_jshheyl42 Ly8gc210ZXN0Mi5jDQovLw0KLy8gRHIuIEdseW4gR293aW5nDQovLyBMZVRv dXJuZWF1IFVuaXZlcnNpdHkNCi8vIENPU0MgNDY1MyAtIEFkdmFuY2VkIE5l dHdvcmtzDQovLw0KLy8gVGhpcyBwcm9ncmFtIGRlbW9uc3RyYXRlcyBob3cg dG8gdXNlIGEgbG9jayB3aXRoIGZvcmsoKWVkIHByb2Nlc3NlcyBieSB1c2lu 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