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authorFilipe David Manana <[email protected]>2010-04-26 13:04:40 +0200
committerRaimo Niskanen <[email protected]>2010-05-20 15:48:17 +0200
commit21a67b797e40df930b83bd407ffc165b3f4b91b2 (patch)
tree268a10e8d1d4cd00c30d3f5ded8f103d9699167a /erts/emulator/drivers/unix
parent3f53a96a8bd0cd4a18f819b6857e6a764706ede5 (diff)
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Add file:advise/4 - a wrapper to the POSIX syscall posix_fadvise
Useful for informing the Operating System about the access pattern for a file's data, so that it can adapt the caching strategy to maximize disk IO performance.
Diffstat (limited to 'erts/emulator/drivers/unix')
-rw-r--r--erts/emulator/drivers/unix/unix_efile.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/erts/emulator/drivers/unix/unix_efile.c b/erts/emulator/drivers/unix/unix_efile.c
index 0cece76221..ea016526ef 100644
--- a/erts/emulator/drivers/unix/unix_efile.c
+++ b/erts/emulator/drivers/unix/unix_efile.c
@@ -1448,3 +1448,14 @@ efile_symlink(Efile_error* errInfo, char* old, char* new)
return check_error(symlink(old, new), errInfo);
#endif
}
+
+int
+efile_fadvise(Efile_error* errInfo, int fd, Sint64 offset,
+ Sint64 length, int advise)
+{
+#ifdef HAVE_POSIX_FADVISE
+ return check_error(posix_fadvise(fd, offset, length, advise), errInfo);
+#else
+ return check_error(0, errInfo);
+#endif
+}