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include/posix: rearrange for standard use of extern "C"

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Consistently place C++ use of extern "C" after all include directives,
within the negative branch of _ASMLANGUAGE if used.

Background from issue #17997:

Declarations that use C linkage should be placed within extern "C"
so the language linkage is correct when the header is included by
a C++ compiler.

Similarly #include directives should be outside the extern "C" to
ensure the language-specific default linkage is applied to any
declarations provided by the included header.

See: https://en.cppreference.com/w/cpp/language/language_linkage
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
This commit is contained in:
Peter Bigot 2019-08-12 12:55:06 -05:00 • committed by Carles Cufí
commit ca6e3dcdc4
10 changed files with 56 additions and 37 deletions
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6
include/posix/semaphore.h
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@ -6,13 +6,13 @@
#ifndef ZEPHYR_INCLUDE_POSIX_SEMAPHORE_H_
#define ZEPHYR_INCLUDE_POSIX_SEMAPHORE_H_
#include <posix/time.h>
#include "posix_types.h"
#ifdef __cplusplus
extern "C" {
#endif
#include <posix/time.h>
#include "posix_types.h"
int sem_destroy(sem_t *semaphore);
int sem_getvalue(sem_t *restrict semaphore, int *restrict value);
int sem_init(sem_t *semaphore, int pshared, unsigned int value);