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400 results
Show changes
Commits on Source (2)
......@@ -226,13 +226,13 @@ typedef struct
struct {
atomic_uint value;
atomic_uint recursion;
_Atomic (const void *) owner;
atomic_ulong owner;
};
#endif
struct {
unsigned int value;
unsigned int recursion;
const void *owner;
unsigned long owner;
} dummy;
};
} vlc_mutex_t;
......@@ -246,7 +246,7 @@ typedef struct
#define VLC_STATIC_MUTEX { \
.value = ATOMIC_VAR_INIT(0), \
.recursion = ATOMIC_VAR_INIT(0), \
.owner = ATOMIC_VAR_INIT(NULL), \
.owner = ATOMIC_VAR_INIT(0), \
}
/**
......@@ -734,19 +734,23 @@ VLC_API void vlc_control_cancel(vlc_cleanup_t *);
/**
* Thread identifier.
*
* This function returns the identifier of the calling thread. The identifier
* cannot change for the entire duration of the thread, and no other thread can
* have the same identifier at the same time in the same process. Typically,
* the identifier is also unique across all running threads of all existing
* processes, but that depends on the operating system.
* This function returns a non-zero unique identifier of the calling thread.
* The identifier cannot change for the entire lifetime of the thread, and two
* concurrent threads cannot have the same identifier.
*
* There are no particular semantics to the thread ID with LibVLC.
* The thread identifier has no defined semantics other than uniqueness,
* and no particular purposes within LibVLC.
* It is provided mainly for tracing and debugging.
*
* \warning This function is not currently implemented on all supported
* platforms. Where not implemented, it returns (unsigned long)-1.
* On some but not all supported platforms, the thread identifier is in fact
* the OS/kernel thread identifier (a.k.a. task PID), and is temporally unique
* not only within the process but across the entire system.
*
* \return the thread identifier (or -1 if unimplemented)
* \note
* The `main()` thread identifier is typically identical to the process
* identifier, but this is not portable.
*
* \return the thread identifier (cannot fail)
*/
VLC_API unsigned long vlc_thread_id(void) VLC_USED;
......
......@@ -67,7 +67,7 @@ static void vlc_mutex_init_common(vlc_mutex_t *mtx, bool recursive)
{
atomic_init(&mtx->value, 0);
atomic_init(&mtx->recursion, recursive);
atomic_init(&mtx->owner, NULL);
atomic_init(&mtx->owner, 0);
}
void vlc_mutex_init(vlc_mutex_t *mtx)
......@@ -80,9 +80,6 @@ void vlc_mutex_init_recursive(vlc_mutex_t *mtx)
vlc_mutex_init_common(mtx, true);
}
static _Thread_local char thread_self[1];
#define THREAD_SELF ((const void *)thread_self)
bool vlc_mutex_held(const vlc_mutex_t *mtx)
{
#if defined(__clang__) && !defined(__apple_build_version__) && (__clang_major__ < 8)
......@@ -101,8 +98,8 @@ bool vlc_mutex_held(const vlc_mutex_t *mtx)
* Even though other threads may modify the owner field at any time,
* they will never make it compare equal to the calling thread.
*/
return THREAD_SELF == atomic_load_explicit(&tmp_mtx->owner,
memory_order_relaxed);
return vlc_thread_id() == atomic_load_explicit(&tmp_mtx->owner,
memory_order_relaxed);
}
void vlc_mutex_lock(vlc_mutex_t *mtx)
......@@ -122,7 +119,7 @@ void vlc_mutex_lock(vlc_mutex_t *mtx)
vlc_atomic_wait(&mtx->value, 2);
vlc_restorecancel(canc);
atomic_store_explicit(&mtx->owner, THREAD_SELF, memory_order_relaxed);
atomic_store_explicit(&mtx->owner, vlc_thread_id(), memory_order_relaxed);
}
int vlc_mutex_trylock(vlc_mutex_t *mtx)
......@@ -149,7 +146,8 @@ int vlc_mutex_trylock(vlc_mutex_t *mtx)
if (atomic_compare_exchange_strong_explicit(&mtx->value, &value, 1,
memory_order_acquire,
memory_order_relaxed)) {
atomic_store_explicit(&mtx->owner, THREAD_SELF, memory_order_relaxed);
atomic_store_explicit(&mtx->owner, vlc_thread_id(),
memory_order_relaxed);
return 0;
}
......@@ -169,7 +167,7 @@ void vlc_mutex_unlock(vlc_mutex_t *mtx)
return;
}
atomic_store_explicit(&mtx->owner, NULL, memory_order_relaxed);
atomic_store_explicit(&mtx->owner, 0, memory_order_relaxed);
switch (atomic_exchange_explicit(&mtx->value, 0, memory_order_release)) {
case 2:
......
......@@ -36,6 +36,7 @@
#include <stdnoreturn.h>
#include <signal.h>
#include <errno.h>
#include <limits.h>
#include <time.h>
#include <assert.h>
......@@ -199,7 +200,10 @@ void vlc_join(vlc_thread_t th, void **result)
VLC_WEAK unsigned long vlc_thread_id(void)
{
return -1;
static thread_local unsigned char dummy;
static_assert (UINTPTR_MAX <= ULONG_MAX, "Type size mismatch");
return (uintptr_t)(void *)&dummy;
}
int vlc_set_priority (vlc_thread_t th, int priority)
......