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Subject: [QUERY] Help With Semaphore Error on Windows : Cygwin
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From: Yeo Kai Wei via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Yeo Kai Wei <yeokaiwei AT hotmail DOT com>
Sender: "Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

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Hi All,

Could I request for some help on some code?

I ran into an error with semaphores with some book code using Cygwin on 
Windows.

The code will throw an error with sem_post().

I compiled it with gcc -o memwriter memwriter.c -lrt -lpthread

$ ./memwriter
Shared memory address: 0x6fffffff0000 [0..511]
backing file: /dev/shm/shMemEx
semptr is address 0x7ffffcc18 with value 0
SEM_VALUE_MAX is 1147483648
sem_post: Invalid argument <--------------------------- ERROR


According to feedback, the above error does not turn up on Linux.

May I know if this is supposed to happen on Cygwin on Windows?

If not, how can I solve this?

I've also attached the code for reference.


Thank you.


Kind regards,

YEO Kai Wei


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