Let me also update the doc. The factual infos come from
https://heldercorreia.com/semaphores-in-mac-os-x-fd7a7418e13b#.vshlwqkfe
2017-03-03 Bruno Haible <br...@clisp.org>
doc: Mention Mac OS X deficiencies regarding semaphores.
* doc/posix-functions/sem_init.texi: Mention status on Mac OS X.
* doc/posix-functions/sem_destroy.texi: Likewise.
* doc/posix-functions/sem_getvalue.texi: Likewise.
diff --git a/doc/posix-functions/sem_destroy.texi
b/doc/posix-functions/sem_destroy.texi
index 31f2b75..380fb62 100644
--- a/doc/posix-functions/sem_destroy.texi
+++ b/doc/posix-functions/sem_destroy.texi
@@ -15,4 +15,7 @@ Portability problems not fixed by Gnulib:
@item
This function is missing on some platforms:
Minix 3.1.8, IRIX 5.3, Solaris 2.4, mingw, MSVC 9, BeOS.
+@item
+This function is not implemented on some platforms:
+Mac OS X 10.11.
@end itemize
diff --git a/doc/posix-functions/sem_getvalue.texi
b/doc/posix-functions/sem_getvalue.texi
index b2baa9e..a00dea5 100644
--- a/doc/posix-functions/sem_getvalue.texi
+++ b/doc/posix-functions/sem_getvalue.texi
@@ -15,4 +15,7 @@ Portability problems not fixed by Gnulib:
@item
This function is missing on some platforms:
Minix 3.1.8, IRIX 5.3, Solaris 2.4, mingw, MSVC 9, BeOS.
+@item
+This function is not implemented on some platforms:
+Mac OS X 10.11.
@end itemize
diff --git a/doc/posix-functions/sem_init.texi
b/doc/posix-functions/sem_init.texi
index c52da75..24adc41 100644
--- a/doc/posix-functions/sem_init.texi
+++ b/doc/posix-functions/sem_init.texi
@@ -15,4 +15,7 @@ Portability problems not fixed by Gnulib:
@item
This function is missing on some platforms:
Minix 3.1.8, IRIX 5.3, Solaris 2.4, mingw, MSVC 9, BeOS.
+@item
+This function is not implemented on some platforms:
+Mac OS X 10.11.
@end itemize
