byte is_fastbuf[0]; /* Dummy field for checking of type casts */
byte *bptr, *bstop; /* Access pointers */
byte *buffer, *bufend; /* Start and end of the buffer */
- byte *name; /* File name for error messages */
+ char *name; /* File name for error messages */
sh_off_t pos; /* Position of bstop in the file */
int (*refill)(struct fastbuf *); /* Get a buffer with new data */
void (*spout)(struct fastbuf *); /* Write buffer data to the file */
int can_overwrite_buffer; /* Can the buffer be altered? (see discussion above) 0=never, 1=temporarily, 2=permanently */
};
-/* FastIO on standard files (specify buffer size 0 to enable mmaping) */
+/* FastIO on files with run-time parametrization */
+enum fb_type { /* Which back-end you want to use */
+ FB_STD, /* Standard buffered I/O */
+ FB_DIRECT, /* Direct I/O bypassing system caches (see fb-direct.c for description) */
+ FB_MMAP /* Memory mapped files */
+};
+
+struct fb_params {
+ enum fb_type type;
+ uns buffer_size;
+ /* FB_STD only */
+ uns keep_back_buf;
+ /* FB_DIRECT only */
+ uns read_ahead;
+ uns write_back;
+ struct asio_queue *asio;
+};
+
+struct cf_section;
+extern struct cf_section fbpar_cf;
+extern struct fb_params fbpar_def;
+
+struct fastbuf *bopen_file(const char *name, int mode, struct fb_params *params); /* Use params==NULL for defaults */
+struct fastbuf *bopen_file_try(const char *name, int mode, struct fb_params *params);
+struct fastbuf *bopen_tmp_file(struct fb_params *params);
+struct fastbuf *bopen_fd(int fd, struct fb_params *params);
+
+/* FastIO on standard files */
+
+struct fastbuf *bfdopen_internal(int fd, const char *name, uns buflen);
struct fastbuf *bopen(const char *name, uns mode, uns buflen);
struct fastbuf *bopen_try(const char *name, uns mode, uns buflen);
struct fastbuf *bopen_tmp(uns buflen);
#define TEMP_FILE_NAME_LEN 256
void temp_file_name(char *name);
+/* Internal functions of some file back-ends */
+
+struct fastbuf *bfmmopen_internal(int fd, const char *name, uns mode);
+
+extern uns fbdir_cheat;
+struct asio_queue;
+struct fastbuf *fbdir_open_fd_internal(int fd, const char *name, struct asio_queue *io_queue, uns buffer_size, uns read_ahead, uns write_back);
+
/* FastIO on in-memory streams */
struct fastbuf *fbmem_create(uns blocksize); /* Create stream and return its writing fastbuf */
struct fastbuf *fbmem_clone_read(struct fastbuf *); /* Create reading fastbuf */
-/* FastIO on memory mapped files */
-
-struct fastbuf *bopen_mm(const char *name, uns mode);
-
/* FastI on file descriptors with limit */
struct fastbuf *bopen_limited_fd(int fd, uns bufsize, uns limit);
void fbgrow_reset(struct fastbuf *b); /* Reset stream and prepare for writing */
void fbgrow_rewind(struct fastbuf *b); /* Prepare for reading */
+/* FastO on memory pools */
+
+struct mempool;
+struct fbpool {
+ struct fastbuf fb;
+ struct mempool *mp;
+};
+
+void fbpool_init(struct fbpool *fb); /* Initialize a new fastbuf */
+void fbpool_start(struct fbpool *fb, struct mempool *mp, uns init_size);
+ /* Start a new continuous block and prepare for writing (see mp_start()) */
+void *fbpool_end(struct fbpool *fb); /* Close the block and return its address (see mp_end()).
+ The length can be determined with mp_size(mp, ptr). */
+
/* FastO with atomic writes for multi-threaded programs */
struct fb_atomic {
/* Configuring stream parameters */
-int bconfig(struct fastbuf *f, uns type, int data);
+enum bconfig_type {
+ BCONFIG_IS_TEMP_FILE,
+ BCONFIG_KEEP_BACK_BUF,
+};
-#define BCONFIG_IS_TEMP_FILE 0
+int bconfig(struct fastbuf *f, uns type, int data);
/* Universal functions working on all fastbuf's */