Cache file descriptors when reading frames, for better readahead and fewer syscalls.

[nageru] / main.cpp

diff --git a/main.cpp b/main.cpp
index e04af2251240379c4288d4e72f7ab2ea670d42a0..681724a4ec4540d26b771bbf8ae4ee1be0f82b1f 100644 (file)
--- a/main.cpp
+++ b/main.cpp
@@ -421,33 +421,3 @@ int record_thread_func()
 
        return 0;
 }
-
-string read_frame(FrameOnDisk frame)
-{
-       string filename;
-       {
-               lock_guard<mutex> lock(frame_mu);
-               filename = frame_filenames[frame.filename_idx];
-       }
-
-       // TODO: cache the open file handles
-       FILE *fp = fopen(filename.c_str(), "rb");
-       if (fp == nullptr) {
-               perror(filename.c_str());
-               exit(1);
-       }
-       if (fseek(fp, frame.offset, SEEK_SET) == -1) {
-               perror("fseek");
-               exit(1);
-       }
-
-       string str;
-       str.resize(frame.size);
-       if (fread(&str[0], frame.size, 1, fp) != 1) {
-               perror("fread");
-               exit(1);
-       }
-
-       fclose(fp);
-       return str;
-}