diff options
Diffstat (limited to 'erts/doc/src/erl_driver.xml')
| -rw-r--r-- | erts/doc/src/erl_driver.xml | 61 |
1 files changed, 39 insertions, 22 deletions
diff --git a/erts/doc/src/erl_driver.xml b/erts/doc/src/erl_driver.xml index efe0483b31..540390e1b1 100644 --- a/erts/doc/src/erl_driver.xml +++ b/erts/doc/src/erl_driver.xml @@ -666,7 +666,7 @@ typedef struct ErlDrvBinary { <item> <p>The <c>ErlDrvData</c> is a handle to driver-specific data, passed to the driver call-backs. It is a pointer, and is - most often type casted to a specific pointer in the driver.</p> + most often type cast to a specific pointer in the driver.</p> </item> <tag>SysIOVec</tag> <item> @@ -1014,7 +1014,7 @@ typedef struct ErlIOVec { <fsummary>Read a system timestamp</fsummary> <desc> <marker id="driver_get_now"></marker> - <p>This function reads a timestamp into the memory pointed to by + <p>This function reads a timestamp into the memory pointed to by the parameter <c>now</c>. See the description of <seealso marker="#ErlDrvNowData">ErlDrvNowData</seealso> for specification of its fields. </p> <p>The return value is 0 unless the <c>now</c> pointer is not @@ -1056,7 +1056,7 @@ typedef struct ErlIOVec { returned. Another thread may still be using the event object internally. To safely close an event object call <c>driver_select</c> with <c>ERL_DRV_USE</c> and <c>on==0</c>. That - will clear all events and then call + will clear all events and then call <seealso marker="driver_entry#stop_select">stop_select</seealso> when it is safe to close the event object. <c>ERL_DRV_USE</c> should be set together with the first event @@ -1068,7 +1068,7 @@ typedef struct ErlIOVec { <p>ERL_DRV_USE was added in OTP release R13. Old drivers will still work as before. But it is recommended to update them to use <c>ERL_DRV_USE</c> and <c>stop_select</c> to make sure that event objects are closed in a safe way.</p> - </note> + </note> <p>The return value is 0 (failure, -1, only if the <c>ready_input</c>/<c>ready_output</c> is <c>NULL</c>).</p> @@ -1524,7 +1524,7 @@ typedef struct ErlIOVec { <marker id="remove_driver_entry"></marker> <p>This function removes a driver entry <c>de</c> previously added with <c>add_driver_entry</c>.</p> - <p>Driver entries added by the <c>erl_ddll</c> erlang interface can + <p>Driver entries added by the <c>erl_ddll</c> erlang interface can not be removed by using this interface.</p> </desc> </func> @@ -1758,7 +1758,7 @@ typedef struct ErlIOVec { <pre> Term type Argument(s) =========================================== -ERL_DRV_NIL +ERL_DRV_NIL ERL_DRV_ATOM ErlDrvTermData atom (from driver_mk_atom(char *string)) ERL_DRV_INT ErlDrvSInt integer ERL_DRV_UINT ErlDrvUInt integer @@ -1779,11 +1779,11 @@ ERL_DRV_EXT2TERM char *buf, ErlDrvUInt len signed integer data type <c>ErlDrvSInt</c> are 64 bits wide on a 64 bit runtime system and 32 bits wide on a 32 bit runtime system. They were introduced in erts version 5.6, - and replaced some of the <c>int</c> arguments in the list above. + and replaced some of the <c>int</c> arguments in the list above. </p> <p>The unsigned integer data type <c>ErlDrvUInt64</c> and the signed integer data type <c>ErlDrvSInt64</c> are always 64 bits - wide. They were introduced in erts version 5.7.4. + wide. They were introduced in erts version 5.7.4. </p> <p>To build the tuple <c>{tcp, Port, [100 | Binary]}</c>, the @@ -1879,7 +1879,7 @@ ERL_DRV_EXT2TERM char *buf, ErlDrvUInt len <fsummary>Send term data from driver to port owner</fsummary> <desc> <marker id="driver_output_term"></marker> - <warning><p><c>driver_output_term()</c> is deferred and will + <warning><p><c>driver_output_term()</c> is deprecated and will be removed in the OTP-R17 release. Use <seealso marker="#erl_drv_send_term">erl_drv_output_term()</seealso> instead.</p> @@ -1937,7 +1937,7 @@ ERL_DRV_EXT2TERM char *buf, ErlDrvUInt len <fsummary>Send term data to other process than port owner process</fsummary> <desc> <marker id="driver_send_term"></marker> - <warning><p><c>driver_send_term()</c> is deferred and will + <warning><p><c>driver_send_term()</c> is deprecated and will be removed in the OTP-R17 release. Use <seealso marker="#erl_drv_send_term">erl_drv_send_term()</seealso> instead.</p> @@ -1981,7 +1981,7 @@ ERL_DRV_EXT2TERM char *buf, ErlDrvUInt len thread, the following call can be used:</p> <p></p> <code type="none"><![CDATA[ - unsigned int myKey = (unsigned int) myPort; + unsigned int myKey = driver_async_port_key(myPort); r = driver_async(myPort, &myKey, myData, myFunc); ]]></code> @@ -1998,7 +1998,7 @@ ERL_DRV_EXT2TERM char *buf, ErlDrvUInt len The data should be freed in <c>async_free</c>, because it's called if <c>driver_async_cancel</c> is called.</p> <p>When the async operation is done, <seealso marker="driver_entry#ready_async">ready_async</seealso> driver - entry function is called. If <c>async_ready</c> is null in + entry function is called. If <c>ready_async</c> is null in the driver entry, the <c>async_free</c> function is called instead.</p> <p>The return value is a handle to the asynchronous task, which @@ -2022,6 +2022,24 @@ ERL_DRV_EXT2TERM char *buf, ErlDrvUInt len </desc> </func> <func> + <name><ret>unsigned int</ret><nametext>driver_async_port_key (ErlDrvPort port)</nametext></name> + <fsummary>Calculate an async key from an ErlDrvPort</fsummary> + <desc> + <marker id="driver_async_port_key"></marker> + <p>This function calculates a key for later use in <seealso + marker="#driver_async">driver_async()</seealso>. The keys are + evenly distributed so that a fair mapping between port id's + and async thread id's is achieved.</p> + <note> + <p>Before OTP-R16, the actual port id could be used as a key + with proper casting, but after the rewrite of the port + subsystem, this is no longer the case. With this function, you + can achieve the same distribution based on port id's as before + OTP-R16.</p> + </note> + </desc> + </func> + <func> <name><ret>int</ret><nametext>driver_async_cancel(long id)</nametext></name> <fsummary>Cancel an asynchronous call</fsummary> <desc> @@ -2033,10 +2051,10 @@ ERL_DRV_EXT2TERM char *buf, ErlDrvUInt len The user had to implement synchronization of cancellation anyway. It also unnecessarily complicated the implementation. Therefore, as of OTP-R15B <c>driver_async_cancel()</c> is deprecated, and - scheduled for removal in OTP-R16. It will currently always fail, + scheduled for removal in OTP-R17. It will currently always fail, and return 0.</p> - <warning><p><c>driver_async_cancel()</c> is deferred and will - be removed in the OTP-R16 release.</p> + <warning><p><c>driver_async_cancel()</c> is deprecated and will + be removed in the OTP-R17 release.</p> </warning> </desc> @@ -2048,7 +2066,7 @@ ERL_DRV_EXT2TERM char *buf, ErlDrvUInt len <marker id="driver_lock_driver"></marker> <p>This function locks the driver used by the port <c>port</c> in memory for the rest of the emulator process' - lifetime. After this call, the driver behaves as one of Erlang's + lifetime. After this call, the driver behaves as one of Erlang's statically linked in drivers.</p> </desc> </func> @@ -2076,7 +2094,7 @@ ERL_DRV_EXT2TERM char *buf, ErlDrvUInt len <seealso marker="driver_entry">driver_entry</seealso>).</item> <tag><c>drv_data</c></tag> <item>The driver defined handle that will be passed in subsequent - calls to driver call-backs. Note, that the + calls to driver call-backs. Note, that the <seealso marker="driver_entry#start">driver start call-back</seealso> will not be called for this new driver instance. The driver defined handle is normally created in the @@ -2284,7 +2302,7 @@ ERL_DRV_EXT2TERM char *buf, ErlDrvUInt len <item>A thread identifier.</item> </taglist> <p>This function compares two thread identifiers for equality, - and returns <c>0</c> it they aren't equal, and + and returns <c>0</c> it they aren't equal, and a value not equal to <c>0</c> if they are equal.</p> <note><p>A Thread identifier may be reused very quickly after a thread has terminated. Therefore, if a thread @@ -2469,7 +2487,7 @@ ERL_DRV_EXT2TERM char *buf, ErlDrvUInt len </taglist> <p>This function broadcasts on a condition variable. That is, if other threads are waiting on the condition variable being - broadcasted on, <em>all</em> of them will be woken. + broadcast on, <em>all</em> of them will be woken. </p> <p>This function is thread-safe.</p> </desc> @@ -2498,7 +2516,7 @@ ERL_DRV_EXT2TERM char *buf, ErlDrvUInt len the calling thread when calling this function. </p> <note><p><c>erl_drv_cond_wait()</c> might return even though - no-one has signaled or broadcasted on the condition + no-one has signaled or broadcast on the condition variable. Code calling <c>erl_drv_cond_wait()</c> should always be prepared for <c>erl_drv_cond_wait()</c> returning even though the condition that the thread was @@ -2822,7 +2840,7 @@ ERL_DRV_EXT2TERM char *buf, ErlDrvUInt len <item>A pointer to an output buffer.</item> <tag><c>value_size</c></tag> <item>A pointer to an integer. The integer is both used for - passing input and output sizes (see below). + passing input and output sizes (see below). </item> </taglist> <p>This function retrieves the value of an environment variable. @@ -2900,4 +2918,3 @@ ERL_DRV_EXT2TERM char *buf, ErlDrvUInt len Guide Ch. 3)</p> </section> </cref> - |