erts: Allow for easier future enif_hash expansion

Allow for expanding support to 64-bit hashes without breaking the
interface.

1 files changed, 7 insertions, 10 deletions

diff --git a/erts/doc/src/erl_nif.xml b/erts/doc/src/erl_nif.xml
index 5faf1a05fc..534c90cbdc 100644
--- a/erts/doc/src/erl_nif.xml
+++ b/erts/doc/src/erl_nif.xml
@@ -823,13 +823,13 @@ typedef enum {
           <item>
             <p>Non-portable hash function that only guarantees the same hash
               for the same term within one Erlang VM instance.</p>
-            <p>Generated hash values within <c>0..2^32-1</c>.</p>
+            <p>It takes 32-bit salt values and generates hashes within <c>0..2^32-1</c>.</p>
           </item>
           <tag><c>ERL_NIF_PHASH2</c></tag>
           <item>
             <p>Portable hash function that gives the same hash for the
               same Erlang term regardless of machine architecture and ERTS version.</p>
-            <p>Generated hash values within <c>0..2^27-1</c>.</p>
+            <p>It takes 32-bit salt values and generates hashes within <c>0..2^27-1</c>.</p>
             <p>Slower than <c>ERL_NIF_INTERNAL_HASH.</c>
               When used with <c>salt=0</c>, it corresponds to
               <seealso marker="erlang#phash2-1"><c>erlang:phash2/1</c></seealso>.</p>
@@ -1411,17 +1411,14 @@ typedef enum {
 
     <func>
       <name>
-        <ret>unsigned long</ret>
-        <nametext>
-          enif_hash(ErlNifHash type, ERL_NIF_TERM term, unsigned long salt)
-        </nametext>
+        <ret>ErlNifUInt64</ret>
+        <nametext>enif_hash(ErlNifHash type, ERL_NIF_TERM term, ErlNifUInt64 salt)</nametext>
       </name>
       <fsummary>Hash terms.</fsummary>
       <desc>
-        <p>Hash <c>term</c> according to the specified
-          <seealso marker="#ErlNifHash"><c>ErlNifHash</c></seealso> <c>type</c>
-          and using the least significant 32 bits of <c>salt</c>.</p>
-        <p>Range of returned value depends on the hash type.</p>
+        <p>Hashes <c>term</c> according to the specified
+          <seealso marker="#ErlNifHash"><c>ErlNifHash</c></seealso> <c>type</c>.</p>
+        <p>Ranges of taken salt and returned value depend on the hash type.</p>
       </desc>
     </func>