diff options
Diffstat (limited to 'erts/doc/src/erl_nif.xml')
| -rw-r--r-- | erts/doc/src/erl_nif.xml | 43 |
1 files changed, 38 insertions, 5 deletions
diff --git a/erts/doc/src/erl_nif.xml b/erts/doc/src/erl_nif.xml index b31052287d..b0a632d2d6 100644 --- a/erts/doc/src/erl_nif.xml +++ b/erts/doc/src/erl_nif.xml @@ -675,6 +675,18 @@ typedef struct { <p>When receiving data from untrusted sources, use option <c>ERL_NIF_BIN2TERM_SAFE</c>.</p> </item> + <tag><marker id="ErlNifMonitor"/><c>ErlNifMonitor</c></tag> + <item> + <p>This is an opaque data type that identifies a monitor.</p> + <p>The nif writer is to provide the memory for storing the + monitor when calling <seealso marker="#enif_monitor_process"> + <c>enif_monitor_process</c></seealso>. The + address of the data is not stored by the runtime system, so + <c>ErlNifMonitor</c> can be used as any other data, it + can be copied, moved in memory, forgotten, and so on. + To compare two monitors, <seealso marker="#enif_compare_monitors"> + <c>enif_compare_monitors</c></seealso> must be used.</p> + </item> <tag><marker id="ErlNifPid"/><c>ErlNifPid</c></tag> <item> <p>A process identifier (pid). In contrast to pid terms (instances of @@ -910,6 +922,21 @@ typedef enum { </func> <func> + <name><ret>int</ret><nametext>enif_compare_monitors(const ErlNifMonitor + *monitor1, const ErlNifMonitor *monitor2)</nametext></name> + <fsummary>Compare two monitors.</fsummary> + <desc> + <marker id="enif_compare_monitors"></marker> + <p>Compares two <seealso marker="#ErlNifMonitor"><c>ErlNifMonitor</c></seealso>s. + Can also be used to imply some artificial order on monitors, + for whatever reason.</p> + <p>Returns <c>0</c> if <c>monitor1</c> and <c>monitor2</c> are equal, + < <c>0</c> if <c>monitor1</c> < <c>monitor2</c>, and + > <c>0</c> if <c>monitor1</c> > <c>monitor2</c>.</p> + </desc> + </func> + + <func> <name><ret>void</ret> <nametext>enif_cond_broadcast(ErlNifCond *cnd)</nametext></name> <fsummary></fsummary> @@ -1042,7 +1069,7 @@ typedef enum { <fsummary>Cancel a process monitor.</fsummary> <desc> <marker id="enif_demonitor_process"></marker> - <p>Cancels a monitor created earlier with <seealso marker="enif_monitor_process"> + <p>Cancels a monitor created earlier with <seealso marker="#enif_monitor_process"> <c>enif_monitor_process</c></seealso>. Argument <c>obj</c> is a pointer to the resource holding the monitor and <c>*mon</c> identifies the monitor.</p> <p>Returns <c>0</c> if the monitor was successfully identified and removed. @@ -1050,6 +1077,7 @@ typedef enum { it was either</p> <list type="bulleted"> <item>never created for this resource</item> + <item>already cancelled</item> <item>already triggered</item> <item>just about to be triggered by a concurrent thread</item> </list> @@ -2182,14 +2210,19 @@ enif_map_iterator_destroy(env, &iter);</code> <marker id="enif_monitor_process"></marker> <p>Starts monitoring a process from a resource. When a process is monitored, a process exit results in a call to the provided - <seealso marker="ErlNifResourceDown"> + <seealso marker="#ErlNifResourceDown"> <c>down</c></seealso> callback associated with the resource type.</p> <p>Argument <c>obj</c> is pointer to the resource to hold the monitor and <c>*target_pid</c> identifies the local process to be monitored.</p> <p>If <c>mon</c> is not <c>NULL</c>, a successful call stores the - identity of the monitor in the struct pointed to by <c>mon</c>. - This identifier is used to refer to the monitor for later removal or - compare. A monitor is automatically removed when it triggers or when + identity of the monitor in the + <seealso marker="#ErlNifMonitor"><c>ErlNifMonitor</c></seealso> + struct pointed to by <c>mon</c>. This identifier is used to refer to the + monitor for later removal with + <seealso marker="#enif_demonitor_process"><c>enif_demonitor_process</c></seealso> + or compare with + <seealso marker="#enif_compare_monitors"><c>enif_compare_monitors</c></seealso>. + A monitor is automatically removed when it triggers or when the resource is deallocated.</p> <p>Returns <c>0</c> on success, < 0 if no <c>down</c> callback is provided, and > 0 if the process is no longer alive.</p> |