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#include "EXTERN.h" |
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#include "perl.h" |
| 3 |
#include "XSUB.h" |
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|
| 5 |
#include <sys/types.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <signal.h> |
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#include <sched.h> |
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|
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typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
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|
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#define STACKSIZE 1024 /* yeah */ |
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|
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enum { REQ_QUIT, REQ_READ, REQ_WRITE, REQ_OPEN, REQ_CLOSE }; |
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|
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typedef struct { |
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char stack[STACKSIZE]; |
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} aio_thread; |
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|
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typedef struct { |
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int type; |
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aio_thread *thread; |
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|
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/* read/write */ |
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int fd; |
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off_t offset; |
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size_t length; |
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ssize_t result; |
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mode_t mode; /* open */ |
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int errorno; |
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SV *data, *callback; |
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void *dataptr; |
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STRLEN dataoffset; |
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} aio_cb; |
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|
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typedef aio_cb *aio_req; |
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|
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static int started; |
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static int nreqs; |
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static int reqpipe[2], respipe[2]; |
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|
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static int aio_proc(void *arg); |
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|
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static void |
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start_thread(void) |
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{ |
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aio_thread *thr; |
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|
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New (0, thr, 1, aio_thread); |
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|
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if (clone (aio_proc, |
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&(thr->stack[STACKSIZE]), |
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CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND, |
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thr) >= 0) |
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started++; |
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else |
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Safefree (thr); |
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} |
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|
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static void |
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end_thread(void) |
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{ |
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aio_req req; |
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New (0, req, 1, aio_cb); |
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req->type = REQ_QUIT; |
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write (reqpipe[1], &req, sizeof (aio_req)); |
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} |
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|
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static void |
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send_req (aio_req req) |
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{ |
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nreqs++; |
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write (reqpipe[1], &req, sizeof (aio_req)); |
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} |
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|
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static void |
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read_write (pTHX_ int dowrite, int fd, off_t offset, size_t length, |
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SV *data, STRLEN dataoffset, SV*callback) |
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{ |
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aio_req req; |
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STRLEN svlen; |
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char *svptr = SvPV (data, svlen); |
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|
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if (dataoffset < 0) |
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dataoffset += svlen; |
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|
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if (dataoffset < 0 || dataoffset > svlen) |
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croak ("data offset outside of string"); |
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|
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if (dowrite) |
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{ |
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/* write: check length and adjust. */ |
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if (length < 0 || length + dataoffset > svlen) |
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length = svlen - dataoffset; |
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} |
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else |
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{ |
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/* read: grow scalar as necessary */ |
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svptr = SvGROW (data, length + dataoffset); |
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} |
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|
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if (length < 0) |
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croak ("length must not be negative"); |
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|
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New (0, req, 1, aio_cb); |
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|
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if (!req) |
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croak ("out of memory during aio_req allocation"); |
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|
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req->type = dowrite ? REQ_WRITE : REQ_READ; |
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req->fd = fd; |
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req->offset = offset; |
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req->length = length; |
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req->data = SvREFCNT_inc (data); |
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req->dataptr = (char *)svptr + dataoffset; |
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req->callback = SvREFCNT_inc (callback); |
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|
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send_req (req); |
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} |
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|
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static int |
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poll_cb (pTHX) |
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{ |
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dSP; |
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int count = 0; |
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aio_req req; |
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|
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while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req)) |
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{ |
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if (req->type == REQ_QUIT) |
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{ |
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Safefree (req->thread); |
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started--; |
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} |
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else |
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{ |
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int errorno = errno; |
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errno = req->errorno; |
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|
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if (req->type == REQ_READ) |
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SvCUR_set (req->data, req->dataoffset |
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+ req->result > 0 ? req->result : 0); |
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|
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PUSHMARK (SP); |
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XPUSHs (sv_2mortal (newSViv (req->result))); |
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PUTBACK; |
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call_sv (req->callback, G_VOID); |
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SPAGAIN; |
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|
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SvREFCNT_dec (req->data); |
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SvREFCNT_dec (req->callback); |
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|
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errno = errorno; |
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nreqs--; |
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count++; |
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} |
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|
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Safefree (req); |
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} |
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|
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return count; |
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} |
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|
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static sigset_t fullsigset; |
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|
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#undef errno |
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#include <asm/unistd.h> |
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|
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static int |
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aio_proc(void *thr_arg) |
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{ |
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aio_thread *thr = thr_arg; |
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aio_req req; |
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int errno; |
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|
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/* we rely on gcc's ability to create closures. */ |
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_syscall3(int,lseek,int,fd,off_t,offset,int,whence) |
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_syscall3(int,read,int,fd,char *,buf,off_t,count) |
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_syscall3(int,write,int,fd,char *,buf,off_t,count) |
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_syscall3(int,open,char *,pathname,int,flags,mode_t,mode) |
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_syscall1(int,close,int,fd) |
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|
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sigprocmask (SIG_SETMASK, &fullsigset, 0); |
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|
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/* then loop */ |
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while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req)) |
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{ |
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req->thread = thr; |
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errno = 0; |
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|
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if (req->type == REQ_READ || req->type == REQ_WRITE) |
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{ |
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if (lseek (req->fd, req->offset, SEEK_SET) == req->offset) |
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{ |
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if (req->type == REQ_READ) |
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req->result = read (req->fd, req->dataptr, req->length); |
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else |
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req->result = write(req->fd, req->dataptr, req->length); |
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} |
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} |
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else if (req->type == REQ_OPEN) |
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{ |
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req->result = open (req->dataptr, req->fd, req->mode); |
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} |
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else if (req->type == REQ_CLOSE) |
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{ |
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req->result = close (req->fd); |
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} |
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else |
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{ |
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write (respipe[1], (void *)&req, sizeof (req)); |
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break; |
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} |
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|
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req->errorno = errno; |
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write (respipe[1], (void *)&req, sizeof (req)); |
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} |
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|
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return 0; |
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} |
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|
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MODULE = Linux::AIO PACKAGE = Linux::AIO |
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|
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BOOT: |
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{ |
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sigfillset (&fullsigset); |
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sigdelset (&fullsigset, SIGTERM); |
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sigdelset (&fullsigset, SIGQUIT); |
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sigdelset (&fullsigset, SIGABRT); |
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sigdelset (&fullsigset, SIGINT); |
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|
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if (pipe (reqpipe) || pipe (respipe)) |
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croak ("unable to initialize request or result pipe"); |
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|
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if (fcntl (respipe[0], F_SETFL, O_NONBLOCK)) |
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croak ("cannot set result pipe to nonblocking mode"); |
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} |
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|
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void |
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min_parallel(nthreads) |
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int nthreads |
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PROTOTYPE: $ |
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CODE: |
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while (nthreads > started) |
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start_thread (); |
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|
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void |
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max_parallel(nthreads) |
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int nthreads |
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PROTOTYPE: $ |
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CODE: |
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int cur = started; |
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while (cur > nthreads) |
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{ |
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end_thread (); |
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cur--; |
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} |
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|
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poll_cb (); |
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while (started > nthreads) |
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{ |
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sched_yield (); |
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fcntl (respipe[0], F_SETFL, 0); |
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poll_cb (); |
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fcntl (respipe[0], F_SETFL, O_NONBLOCK); |
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} |
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|
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void |
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aio_read(fh,offset,length,data,dataoffset,callback) |
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InOutStream fh |
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UV offset |
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IV length |
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SV * data |
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IV dataoffset |
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SV * callback |
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PROTOTYPE: $$$$$$ |
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ALIAS: |
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aio_write = 1 |
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CODE: |
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SvUPGRADE (data, SVt_PV); |
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SvPOK_on (data); |
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read_write (aTHX_ ix, PerlIO_fileno (fh), offset, length, data, dataoffset, callback); |
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|
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void |
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aio_open(pathname,flags,mode,callback) |
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char * pathname |
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int flags |
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int mode |
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SV * callback |
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PROTOTYPE: $$$$ |
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CODE: |
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aio_req req; |
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|
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New (0, req, 1, aio_cb); |
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|
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if (!req) |
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croak ("out of memory during aio_req allocation"); |
| 299 |
|
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req->type = REQ_OPEN; |
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req->dataptr = pathname; |
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req->fd = flags; |
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req->mode = mode; |
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req->callback = SvREFCNT_inc (callback); |
| 305 |
|
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send_req (req); |
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|
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void |
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aio_close(fh,callback) |
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InOutStream fh |
| 311 |
SV * callback |
| 312 |
PROTOTYPE: $ |
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CODE: |
| 314 |
aio_req req; |
| 315 |
|
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New (0, req, 1, aio_cb); |
| 317 |
|
| 318 |
if (!req) |
| 319 |
croak ("out of memory during aio_req allocation"); |
| 320 |
|
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req->type = REQ_CLOSE; |
| 322 |
req->fd = PerlIO_fileno (fh); |
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req->callback = SvREFCNT_inc (callback); |
| 324 |
|
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send_req (req); |
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|
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int |
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poll_fileno() |
| 329 |
PROTOTYPE: |
| 330 |
CODE: |
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RETVAL = respipe[0]; |
| 332 |
OUTPUT: |
| 333 |
RETVAL |
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|
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int |
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poll_cb(...) |
| 337 |
PROTOTYPE: |
| 338 |
CODE: |
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RETVAL = poll_cb (aTHX); |
| 340 |
OUTPUT: |
| 341 |
RETVAL |
| 342 |
|
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int |
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nreqs() |
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PROTOTYPE: |
| 346 |
CODE: |
| 347 |
RETVAL = nreqs; |
| 348 |
OUTPUT: |
| 349 |
RETVAL |
| 350 |
|
