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#include "EXTERN.h" |
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#include "perl.h" |
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#include "XSUB.h" |
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|
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#include <sys/types.h> |
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#include <unistd.h> |
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#include <sched.h> |
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|
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#define STACKSIZE 128 /* yeah */ |
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|
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#define REQ_QUIT 0 |
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#define REQ_READ 1 |
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#define REQ_WRITE 2 |
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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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int errorno; |
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|
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SV *data; |
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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 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 = 0; |
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write (reqpipe[1], &req, sizeof (aio_req)); |
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started--; |
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} |
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|
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static void |
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set_errno(int errorno) |
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{ |
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errno = errorno; |
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} |
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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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int sig; |
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int errno; |
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aio_req req; |
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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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|
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/* first get rid of any signals */ |
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for (sig = 1; sig < _NSIG; sig++) |
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if (sig != SIGTERM) |
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signal (sig, SIG_IGN); |
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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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|
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if (req->type == REQ_READ || req->type == REQ_WRITE) |
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{ |
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errno = 0; |
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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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req->errorno = errno; |
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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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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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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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|
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void |
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min_parallel(nthreads) |
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int nthreads |
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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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CODE: |
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while (started > nthreads) |
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end_thread (); |
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|
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void |
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read(fh,offset,length,data,dataoffset,callback) |
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CODE: |
