From fc0477a67641b9ba344de595b7fec2431208f8e6 Mon Sep 17 00:00:00 2001
From: Rickard Green <rickard@erlang.org>
Date: Tue, 24 Jan 2017 19:50:25 +0100
Subject: Atomic reference count of binaries also in non-SMP

NIF resources was not handled in a thread-safe manner in the runtime
system without SMP support.

As a consequence of this fix, the following driver functions are now
thread-safe also in the runtime system without SMP support:
- driver_free_binary()
- driver_realloc_binary()
- driver_binary_get_refc()
- driver_binary_inc_refc()
- driver_binary_dec_refc()
---
 erts/doc/src/erl_driver.xml | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

(limited to 'erts/doc/src')

diff --git a/erts/doc/src/erl_driver.xml b/erts/doc/src/erl_driver.xml
index d8bf45c523..7fbe97bc0b 100644
--- a/erts/doc/src/erl_driver.xml
+++ b/erts/doc/src/erl_driver.xml
@@ -1103,8 +1103,7 @@ r = driver_async(myPort, &myKey, myData, myFunc);    ]]></code>
         <marker id="driver_binary_dec_refc"></marker>
         <p>Decrements the reference count on <c>bin</c> and returns
           the reference count reached after the decrement.</p>
-        <p>This function is only thread-safe when the emulator with SMP
-          support is used.</p>
+        <p>This function is thread-safe.</p>
         <note>
           <p>The reference count of driver binary is normally to be decremented
             by calling <seealso marker="#driver_free_binary">
@@ -1124,8 +1123,7 @@ r = driver_async(myPort, &myKey, myData, myFunc);    ]]></code>
       <desc>
         <marker id="driver_binary_get_refc"></marker>
         <p>Returns the current reference count on <c>bin</c>.</p>
-        <p>This function is only thread-safe when the emulator with SMP
-          support is used.</p>
+        <p>This function is thread-safe.</p>
       </desc>
     </func>
 
@@ -1137,8 +1135,7 @@ r = driver_async(myPort, &myKey, myData, myFunc);    ]]></code>
         <marker id="driver_binary_inc_refc"></marker>
         <p>Increments the reference count on <c>bin</c> and returns
           the reference count reached after the increment.</p>
-        <p>This function is only thread-safe when the emulator with SMP
-          support is used.</p>
+        <p>This function is thread-safe.</p>
       </desc>
     </func>
 
@@ -1434,8 +1431,7 @@ r = driver_async(myPort, &myKey, myData, myFunc);    ]]></code>
         <seealso marker="#driver_alloc_binary">
         <c>driver_alloc_binary</c></seealso>. As binaries
           in Erlang are reference counted, the binary can still be around.</p>
-        <p>This function is only thread-safe when the emulator with SMP
-          support is used.</p>
+        <p>This function is thread-safe.</p>
       </desc>
     </func>
 
@@ -1872,8 +1868,7 @@ r = driver_async(myPort, &myKey, myData, myFunc);    ]]></code>
         <p>Resizes a driver binary, while keeping the data.</p>
         <p>Returns the resized driver binary on success. Returns <c>NULL</c>
           on failure (out of memory).</p>
-        <p>This function is only thread-safe when the emulator with SMP
-          support is used.</p>
+        <p>This function is thread-safe.</p>
       </desc>
     </func>
 
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