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/*
=head1 NAME
mutex.c - Imager's mutex API.
=head1 FUNCTIONS
=over
=cut
*/
#include "imageri.h"
#include <windows.h>
struct i_mutex_tag {
CRITICAL_SECTION section;
};
/*
=item i_mutex_new()
=category Mutex functions
=synopsis i_mutex_t m = i_mutex_new();
=order 10
Create a mutex.
If a critical section cannot be created for whatever reason, Imager
will abort.
=cut
*/
i_mutex_t
i_mutex_new(void) {
i_mutex_t m;
m = malloc(sizeof(*m));
if (!m)
i_fatal(3, "Cannot allocate mutex object");
InitializeCriticalSection(&(m->section));
return m;
}
/*
=item i_mutex_destroy(m)
=category Mutex functions
=synopsis i_mutex_destroy(m);
Destroy a mutex.
=cut
*/
void
i_mutex_destroy(i_mutex_t m) {
DeleteCriticalSection(&(m->section));
free(m);
}
/*
=item i_mutex_lock(m)
=category Mutex functions
=synopsis i_mutex_lock(m);
Lock the mutex, waiting if another thread has the mutex locked.
=cut
*/
void
i_mutex_lock(i_mutex_t m) {
EnterCriticalSection(&(m->section));
}
/*
=item i_mutex_unlock(m)
=category Mutex functions
=synopsis i_mutex_unlock(m);
Release the mutex.
The behavior of releasing a mutex you don't hold is unspecified.
=cut
*/
void
i_mutex_unlock(i_mutex_t m) {
LeaveCriticalSection(&(m->section));
}
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