* errno.cc (errmap): Change mapping of NO_SYSTEM_RESOURCES to EFBIG.
* fhandler.cc (MAX_OVERLAPPED_WRITE_LEN): New constant. (MIN_OVERLAPPED_WRITE_LEN): Ditto. (fhandler_base_overlapped::close): Accommodate change in arguments to wait_overlapped. (fhandler_base_overlapped::setup_overlapped): Add __stdcall and regparm modifiers. (fhandler_base_overlapped::destroy_overlapped): Ditto. (fhandler_base_overlapped::has_ongoing_io): Ditto. (fhandler_base_overlapped::wait_overlapped): Modify to return an enum returning various states. Accept nonblocking parameter. (fhandler_base_overlapped::read_overlapped): Add __stdcall and regparm modifiers. Rework to attempt to be smarter about reacting to states returned by wait_overlapped. (fhandler_base_overlapped::write_overlapped): Ditto. Add fallback option for when wait_overlapped detects that smaller chunks must be written. (fhandler_base_overlapped::write_overlapped_fallback): Ditto. * fhandler.h (DEFAULT_PIPEBUFSIZE): Move definition here from pipe.cc. (fhandler_base::has_ongoing_io): Define with __stdcall and regparm modifiers. (fhandler_base_overlapped::wait_return): New enum. (fhandler_base_overlapped::max_atomic_write): New variable. (fhandler_base_overlapped:: wait_overlapped): Accommodate changes mentioned above to arguments and modifiers. (fhandler_base_overlapped::setup_overlapped): Ditto for modifiers. (fhandler_base_overlapped::read_overlapped): Ditto. (fhandler_base_overlapped::write_overlapped): Ditto. (fhandler_base_overlapped::destroy_overlapped): Ditto. (fhandler_base_overlapped::has_ongoing_io): Ditto. (fhandler_base_overlapped::fhandler_base_overlapped): Zero max_atomic_write. * fhandler_fifo.cc (fhandler_fifo::fhandler_fifo): Set max_atomic_write to the size of the DEFAULT_PIPEBUFSIZE. (fhandler_fifo::wait): Accommodate change in arguments to wait_overlapped. * pipe.cc (fhandler_pipe::fhandler_pipe): Set max_atomic_write to the size of the DEFAULT_PIPEBUFSIZE. (fhandler_pipe::create_selectable): Allow minimum size of DEFAULT_PIPEBUFSIZE. (DEFAULT_PIPEBUFSIZE): Delete here, move to fhandler.h.
This commit is contained in:
Christopher Faylor
@@ -29,6 +29,9 @@ details. */
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#include "cygtls.h"
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#include "sigproc.h"
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#define MAX_OVERLAPPED_WRITE_LEN (64 * 1024 * 1024)
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#define MIN_OVERLAPPED_WRITE_LEN (1 * 1024 * 1024)
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static NO_COPY const int CHUNK_SIZE = 1024; /* Used for crlf conversions */
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struct __cygwin_perfile *perfile_table;
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@@ -1056,8 +1059,7 @@ fhandler_base_overlapped::close ()
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if (is_nonblocking () && io_pending)
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{
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DWORD bytes;
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set_nonblocking (false);
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wait_overlapped (1, !!(get_access () & GENERIC_WRITE), &bytes);
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wait_overlapped (1, !!(get_access () & GENERIC_WRITE), &bytes, false);
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}
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destroy_overlapped ();
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return fhandler_base::close ();
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@@ -1686,7 +1688,7 @@ fhandler_base::fpathconf (int v)
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/* Overlapped I/O */
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int
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int __stdcall __attribute__ ((regparm (1)))
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fhandler_base_overlapped::setup_overlapped ()
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{
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OVERLAPPED *ov = get_overlapped_buffer ();
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@@ -1696,7 +1698,7 @@ fhandler_base_overlapped::setup_overlapped ()
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return ov->hEvent ? 0 : -1;
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}
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void
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void __stdcall __attribute__ ((regparm (1)))
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fhandler_base_overlapped::destroy_overlapped ()
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{
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OVERLAPPED *ov = get_overlapped ();
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@@ -1709,7 +1711,7 @@ fhandler_base_overlapped::destroy_overlapped ()
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get_overlapped () = NULL;
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}
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bool
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bool __stdcall __attribute__ ((regparm (1)))
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fhandler_base_overlapped::has_ongoing_io ()
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{
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if (!io_pending)
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@@ -1723,27 +1725,25 @@ fhandler_base_overlapped::has_ongoing_io ()
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return false;
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}
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int
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fhandler_base_overlapped::wait_overlapped (bool inres, bool writing, DWORD *bytes, DWORD len)
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fhandler_base_overlapped::wait_return __stdcall __attribute__ ((regparm (3)))
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fhandler_base_overlapped::wait_overlapped (bool inres, bool writing, DWORD *bytes, bool nonblocking, DWORD len)
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{
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if (!get_overlapped ())
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return inres;
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int res = 0;
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return inres ? overlapped_success : overlapped_error;
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DWORD err = GetLastError ();
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if (is_nonblocking ())
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if (err == ERROR_NO_SYSTEM_RESOURCES)
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return overlapped_fallback;
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wait_return res = overlapped_error;
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if (nonblocking)
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{
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if (inres || err == ERROR_IO_PENDING)
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{
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io_pending = err == ERROR_IO_PENDING;
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if (writing && !inres)
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*bytes = len; /* This really isn't true but it seems like
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this is a corner-case for linux's
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non-blocking I/O implementation. How can
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you know how many bytes were written until
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the I/O operation really completes? */
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res = 1;
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*bytes = len;
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res = overlapped_success;
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err = 0;
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}
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}
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@@ -1768,9 +1768,11 @@ fhandler_base_overlapped::wait_overlapped (bool inres, bool writing, DWORD *byte
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if (signalled)
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{
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debug_printf ("got a signal");
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set_errno (EINTR);
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if (!_my_tls.call_signal_handler ())
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set_errno (EINTR);
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else
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res = overlapped_signal;
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*bytes = (DWORD) -1;
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res = 0;
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err = 0;
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}
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else if (!wores)
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@@ -1781,7 +1783,7 @@ fhandler_base_overlapped::wait_overlapped (bool inres, bool writing, DWORD *byte
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else
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{
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debug_printf ("normal %s, %u bytes", writing ? "write" : "read", *bytes);
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res = 1;
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res = overlapped_success;
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err = 0;
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}
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}
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@@ -1793,14 +1795,13 @@ fhandler_base_overlapped::wait_overlapped (bool inres, bool writing, DWORD *byte
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debug_printf ("err %u", err);
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__seterrno_from_win_error (err);
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*bytes = (DWORD) -1;
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res = 0;
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res = overlapped_error;
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}
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else
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{
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res = 1;
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*bytes = 0;
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err = 0;
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debug_printf ("EOF");
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*bytes = 0;
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res = overlapped_success;
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}
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if (writing && (err == ERROR_NO_DATA || err == ERROR_BROKEN_PIPE))
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@@ -1808,39 +1809,119 @@ fhandler_base_overlapped::wait_overlapped (bool inres, bool writing, DWORD *byte
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return res;
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}
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void __stdcall
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void __stdcall __attribute__ ((regparm (3)))
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fhandler_base_overlapped::read_overlapped (void *ptr, size_t& len)
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{
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DWORD nbytes;
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if (has_ongoing_io ())
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nbytes = (DWORD) -1;
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else
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while (1)
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{
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bool res = ReadFile (get_handle (), ptr, len, &nbytes,
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get_overlapped ());
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int wres = wait_overlapped (res, false, &nbytes);
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if (wres || !_my_tls.call_signal_handler ())
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break;
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}
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{
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bool keep_looping;
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do
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{
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bool res = ReadFile (get_handle (), ptr, len, &nbytes,
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get_overlapped ());
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switch (wait_overlapped (res, false, &nbytes, is_nonblocking ()))
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{
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case overlapped_signal:
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keep_looping = true;
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break;
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default: /* Added to quiet gcc */
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case overlapped_success:
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case overlapped_error:
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case overlapped_fallback:
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keep_looping = false;
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break;
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}
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}
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while (keep_looping);
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}
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len = (size_t) nbytes;
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}
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ssize_t __stdcall
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ssize_t __stdcall __attribute__ ((regparm (3)))
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fhandler_base_overlapped::write_overlapped (const void *ptr, size_t len)
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{
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DWORD nbytes;
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if (has_ongoing_io ())
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nbytes = (DWORD) -1;
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else
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while (1)
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{
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bool res = WriteFile (get_output_handle (), ptr, len, &nbytes,
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get_overlapped ());
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int wres = wait_overlapped (res, true, &nbytes, (size_t) len);
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if (wres || !_my_tls.call_signal_handler ())
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break;
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}
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{
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bool keep_looping;
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if (is_nonblocking () && max_atomic_write && len > max_atomic_write)
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len = max_atomic_write;
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do
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{
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bool res = WriteFile (get_output_handle (), ptr, len, &nbytes,
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get_overlapped ());
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switch (wait_overlapped (res, true, &nbytes, (size_t) len))
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{
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case overlapped_fallback:
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nbytes = write_overlapped_fallback (ptr, len);
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/* fall through intentionally */;
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case overlapped_signal:
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keep_looping = true;
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break;
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default: /* Added to quiet gcc */
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case overlapped_success:
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case overlapped_error:
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keep_looping = false;
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break;
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}
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}
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while (keep_looping);
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}
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debug_printf ("returning %u", nbytes);
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return nbytes;
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}
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/* On XP (at least) the size of the buffer that can be used to write to a pipe
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(pipes are currently the only thing using the overlapped methods) is
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limited. This function is a fallback for when that problem is detected.
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It writes to the pipe using smaller buffers but masks this behavior
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to the caller. */
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ssize_t __stdcall __attribute__ ((regparm (3)))
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fhandler_base_overlapped::write_overlapped_fallback (const void *ptr, size_t orig_len)
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{
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size_t chunk;
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if (orig_len > MAX_OVERLAPPED_WRITE_LEN)
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chunk = MAX_OVERLAPPED_WRITE_LEN;
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else if (orig_len > MIN_OVERLAPPED_WRITE_LEN)
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chunk = MIN_OVERLAPPED_WRITE_LEN;
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else
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chunk = orig_len / 4;
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ssize_t nbytes = 0;
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DWORD nbytes_now = 0;
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while ((size_t) nbytes < orig_len)
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{
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size_t left = orig_len - nbytes;
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size_t len;
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if (left > chunk)
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len = chunk;
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else
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len = left;
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bool res = WriteFile (get_output_handle (), ptr, len, &nbytes_now,
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get_overlapped ());
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/* The nonblocking case is not going to be used currently and may
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eventually disappear. */
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switch (wait_overlapped (res, true, &nbytes_now,
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left <= chunk ? is_nonblocking () : false,
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(size_t) len))
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{
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case overlapped_success:
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nbytes += nbytes_now;
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/* fall through intentionally */
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case overlapped_signal:
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break; /* keep looping */
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case overlapped_error:
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case overlapped_fallback: /* Could make this more adaptive
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if needed */
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orig_len = 0; /* terminate loop */
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break;
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}
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}
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if (!nbytes)
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nbytes = nbytes_now;
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return nbytes;
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}
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Reference in New Issue
Block a user