gstreamer/docs/gst/tmpl/gstatomic.sgml

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GstAtomic

<!-- ##### SECTION Short_Description ##### -->
Macros that implement atomic operations

<!-- ##### SECTION Long_Description ##### -->
<para>
GstAtomic contains a set of macros that can be used to implement
atomic algorithms that are thread safe and don't use heavyweight
locking mechanisms.
</para>

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<para>
#GstMemChunk
</para>

<!-- ##### STRUCT GstAtomicInt ##### -->
<para>
A structure that contains an integer that can be modified
atomically.
</para>


<!-- ##### MACRO GST_ATOMIC_INT_INIT ##### -->
<para>
Initialize an atomic int
</para>

@ref: a reference to a #GstAtomicInt
@val: The initial value for the integer


<!-- ##### MACRO GST_ATOMIC_INT_FREE ##### -->
<para>
Free the memory allocated by #GST_ATOMIC_INT_INIT
</para>

@ref: A reference to a #GstAtomicInt


<!-- ##### MACRO GST_ATOMIC_INT_SET ##### -->
<para>
Set the value of a #GstAtomicInt atomically
</para>

@ref: a reference to a #GstAtomicInt
@val: The value for the integer


<!-- ##### MACRO GST_ATOMIC_INT_VALUE ##### -->
<para>
Get the value of a #GstAtomicInt atomically
</para>

@ref: a reference to a #GstAtomicInt


<!-- ##### MACRO GST_ATOMIC_INT_READ ##### -->
<para>
Get the value of a #GstAtomicInt atomically into a variable
</para>

@ref: a reference to a #GstAtomicInt
@res: a pointer to a gint to hold the value


<!-- ##### MACRO GST_ATOMIC_INT_INC ##### -->
<para>
Increment the value of a #GstAtomicInt atomically
</para>

@ref: a reference to a #GstAtomicInt


<!-- ##### MACRO GST_ATOMIC_INT_DEC_AND_TEST ##### -->
<para>
Decrement the value of a #GstAtomicInt atomically and test
for zero.
</para>

@ref: a reference to a #GstAtomicInt
@zero: a gpointer to a gboolean to hold the value of the test


<!-- ##### MACRO GST_ATOMIC_INT_ADD ##### -->
<para>
Atomically add a value to a #GstAtomicInt
</para>

@ref: a reference to a #GstAtomicInt
@count: The value to add


<!-- ##### STRUCT GstAtomicSwap ##### -->
<para>
The structure to handle values that can be swapped atomically
</para>

@lock: 

<!-- ##### MACRO GST_ATOMIC_SWAP_VALUE ##### -->
<para>
Get the value of a #GstAtomicSwap
</para>

@swap: a reference to a #GstAtomicSwap


<!-- ##### MACRO GST_ATOMIC_SWAP_INIT ##### -->
<para>
Initialize an atomic swap structure
</para>

@swap: a reference to a #GstAtomicSwap
@val: the initial value


<!-- ##### MACRO GST_ATOMIC_SWAP ##### -->
<para>
Atomically swap the value of the #GstAtomicSwap with a new value
</para>

@swap: a reference to a #GstAtomicSwap
@val: the new value


<!-- ##### MACRO GST_ATOMIC_SWAP_GET ##### -->
<para>
Atomically swap the value of the #GstAtomicSwap with a new value and
get the old value.
</para>

@swap: a reference to a #GstAtomicSwap
@val: the new value
@res: the old value