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- from Rev 24 to Rev 33
- ↔ Reverse comparison
Rev 24 → Rev 33
/cma_thread_io.h
0,0 → 1,457
/* |
* (c) Copyright 1990-1996 OPEN SOFTWARE FOUNDATION, INC. |
* (c) Copyright 1990-1996 HEWLETT-PACKARD COMPANY |
* (c) Copyright 1990-1996 DIGITAL EQUIPMENT CORPORATION |
* (c) Copyright 1991, 1992 Siemens-Nixdorf Information Systems |
* To anyone who acknowledges that this file is provided "AS IS" without |
* any express or implied warranty: permission to use, copy, modify, and |
* distribute this file for any purpose is hereby granted without fee, |
* provided that the above copyright notices and this notice appears in |
* all source code copies, and that none of the names listed above be used |
* in advertising or publicity pertaining to distribution of the software |
* without specific, written prior permission. None of these organizations |
* makes any representations about the suitability of this software for |
* any purpose. |
*/ |
/* |
* Header file for thread synchrounous I/O |
*/ |
|
#ifndef CMA_THREAD_IO |
#define CMA_THREAD_IO |
|
/* |
* INCLUDE FILES |
*/ |
|
#include <cma_config.h> |
#include <sys/file.h> |
#include <cma.h> |
#include <sys/types.h> |
#include <sys/time.h> |
#include <cma_init.h> |
#include <cma_errors.h> |
|
/* |
* CONSTANTS |
*/ |
|
/* |
* Define symbols which indicate whether to compile code for obsolete |
* "non-blocking mode" flags: FNDELAY and FNBLOCK. If the obsolete |
* symbols are defined, and if their replacement symbols are defined |
* and are different or if they are undefined, then define a symbol |
* that says to compile the code in; otherwise no code will be compiled |
* for these obsolete symbols. |
*/ |
#ifdef FNDELAY |
# ifdef O_NDELAY |
# if O_NDELAY != FNDELAY |
# define _CMA_FNDELAY_ |
# endif |
# else |
# define _CMA_FNDELAY_ |
# endif |
#endif |
|
#ifdef FNBLOCK |
# ifdef O_NONBLOCK |
# if O_NONBLOCK != FNBLOCK |
# define _CMA_FNBLOCK_ |
# endif |
# else |
# define _CMA_FNBLOCK_ |
# endif |
#endif |
|
|
extern cma_t_boolean cma_is_open(int); |
/* |
* Maximum number of files (ie, max_fd+1) |
*/ |
#define cma__c_mx_file FD_SETSIZE |
|
/* |
* Number of bits per file descriptor bit mask (ie number of bytes * bits/byte) |
*/ |
#define cma__c_nbpm NFDBITS |
|
/* |
* TYPE DEFINITIONS |
*/ |
|
typedef enum CMA__T_IO_TYPE { |
cma__c_io_read = 0, |
cma__c_io_write = 1, |
cma__c_io_except = 2 |
} cma__t_io_type; |
#define cma__c_max_io_type 2 |
|
/* |
* From our local <sys/types.h>: |
* |
* typedef long fd_mask; |
* |
* typedef struct fd_set { |
* fd_mask fds_bits[howmany(FD_SETSIZE, NFDBITS)]; |
* } fd_set; |
* |
*/ |
typedef fd_mask cma__t_mask; |
typedef fd_set cma__t_file_mask; |
|
|
/* |
* GLOBAL DATA |
*/ |
|
/* |
* Maximum number of files (ie, max_fd+1) as determined by getdtablesize(). |
*/ |
extern int cma__g_mx_file; |
|
/* |
* Number of submasks (ie "int" sized chunks) per file descriptor mask as |
* determined by getdtablesize(). |
*/ |
extern int cma__g_nspm; |
|
/* |
* MACROS |
*/ |
|
/* |
* Define a constant for the errno value which indicates that the requested |
* operation was not performed because it would block the process. |
*/ |
# define cma__is_blocking(s) \ |
((s == EAGAIN) || (s == EWOULDBLOCK) || (s == EINPROGRESS) || \ |
(s == EALREADY) || (s == EDEADLK)) |
|
/* |
* It is necessary to issue an I/O function, before calling cma__io_wait() |
* in the following cases: |
* |
* * This file descriptor has been set non-blocking by CMA |
* * This file descriptor has been set non-blocking by the user. |
*/ |
|
#define cma__issue_io_call(fd) \ |
( (cma__g_file[fd]->non_blocking) || \ |
(cma__g_file[fd]->user_fl.user_non_blocking) ) |
|
|
#define cma__set_user_nonblocking(flags) \ |
|
/* |
* Determine if the file is open |
*/ |
/* |
* If the file gets closed while waiting for the mutex cma__g_file[rfd] |
* gets set to null. This results in a crash if NDEBUG is set to 0 |
* since cma__int_lock tries to dereference it to set the mutex ownership |
* after it gets the mutex. The following will still set the ownership |
* in cma__int_lock so we'll set it back to noone if cma__g_file is null |
* when we come back just in case it matters. It shouldn't since its no |
* longer in use but..... |
* Callers of this should recheck cma__g_file after the reservation to |
* make sure continueing makes sense. |
*/ |
#define cma__fd_reserve(rfd) \ |
{ \ |
cma__t_int_mutex *__mutex__; \ |
__mutex__ = cma__g_file[rfd]->mutex; \ |
cma__int_lock (__mutex__); \ |
if(cma__g_file[rfd] == (cma__t_file_obj *)cma_c_null_ptr) \ |
cma__int_unlock(__mutex__); \ |
} |
|
|
/* |
* Unreserve a file descriptor |
*/ |
#define cma__fd_unreserve(ufd) cma__int_unlock (cma__g_file[ufd]->mutex) |
|
/* |
* AND together two select file descriptor masks |
*/ |
#define cma__fdm_and(target,a,b) \ |
{ \ |
int __i__ = cma__g_nspm; \ |
while (__i__--) \ |
(target)->fds_bits[__i__] = \ |
(a)->fds_bits[__i__] & (b)->fds_bits[__i__]; \ |
} |
|
/* |
* Clear a bit in a select file descriptor mask |
* |
* FD_CLR(n, p) := ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS))) |
*/ |
#define cma__fdm_clr_bit(n,p) FD_CLR (n, p) |
|
/* |
* Copy the contents of one file descriptor mask into another. If the |
* destination operand is null, do nothing; if the source operand is null, |
* simply zero the destination. |
*/ |
#define cma__fdm_copy(src,dst,nfds) { \ |
if (dst) \ |
if (src) { \ |
cma__t_mask *__s__ = (cma__t_mask *)(src); \ |
cma__t_mask *__d__ = (cma__t_mask *)(dst); \ |
int __i__; \ |
for (__i__ = 0; __i__ < (nfds); __i__ += cma__c_nbpm) \ |
*__d__++ = *__s__++; \ |
} \ |
else \ |
cma__fdm_zero (dst); \ |
} |
|
/* |
* To increment count for each bit set in fd - mask |
*/ |
#define cma__fdm_count_bits(map,count) \ |
{ \ |
int __i__ = cma__g_nspm; \ |
while (__i__--) { \ |
cma__t_mask __tm__; \ |
__tm__ = (map)->fds_bits[__i__]; \ |
while(__tm__) { \ |
(count)++; \ |
__tm__ &= ~(__tm__ & (-__tm__)); /* Assumes 2's comp */ \ |
} \ |
} \ |
} |
|
/* |
* Test if a bit is set in a select file descriptor mask |
* |
* FD_ISSET(n,p) := ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS))) |
*/ |
#define cma__fdm_is_set(n,p) FD_ISSET (n, p) |
|
/* |
* OR together two select file descriptor masks |
*/ |
#define cma__fdm_or(target,a,b) \ |
{ \ |
int __i__ = cma__g_nspm; \ |
while (__i__--) \ |
(target)->fds_bits[__i__] = \ |
(a)->fds_bits[__i__] | (b)->fds_bits[__i__]; \ |
} |
|
/* |
* Set a bit in a select file descriptor mask |
* |
* FD_SET(n,p) := ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS))) |
*/ |
#define cma__fdm_set_bit(n,p) FD_SET (n, p) |
|
/* |
* Clear a select file descriptor mask. |
*/ |
#define cma__fdm_zero(n) \ |
cma__memset ((char *) n, 0, cma__g_nspm * sizeof(cma__t_mask)) |
|
|
|
/* |
* CMA "thread-synchronous" I/O read/write operations |
*/ |
|
/* |
* Since all CMA "thread-synchronous" I/O (read or write) operations on |
* U*ix follow the exact same structure, the wrapper routines have been |
* condensed into a macro. |
* |
* The steps performed are as follows: |
* 1. Check that the file descriptor is a legitimate value. |
* 2. Check that the entry in the CMA file "database" which corresponds to |
* the file descriptor indicates that the "file" was "opened" by CMA. |
* 3. Reserve the file, to serialized access to files. This not only |
* simplifies things, but also defends against non-reentrancy. |
* 4. If the "file" is "set" for non-blocking I/O, check if we |
* have actually set the file non-blocking yet, and if not do so. |
* Then, issue the I/O operantion. |
* Success or failure is returned immediately, after unreserving the |
* file. If the error indicates that the operation would have caused |
* the process to block, continue to the next step. |
* 5. The I/O prolog adds this "file" to the global bit mask, which |
* represents all "files" which have threads waiting to perform I/O on |
* them, and causes the thread to block on the condition variable for |
* this "file". Periodically, a select is done on this global bit |
* mask, and the condition variables corresponding to "files" which |
* are ready for I/O are signaled, releasing those waiting threads to |
* perform their I/O. |
* 6. When the thread returns from the I/O prolog, it can (hopefully) |
* perform its operation without blocking the process. |
* 7. The I/O epilog clears the bit in the global mask and/or signals the |
* the next thread waiting for this "file", as appropriate. |
* 8. If the I/O failed, continue to loop. |
* 9. Finally, the "file" is unreserved, as we're done with it, and the |
* result of the operation is returned. |
* |
* |
* Note: currently, we believe that timeslicing which is based on the |
* virtual-time timer does not cause system calls to return EINTR. |
* Threfore, any EINTR returns are relayed directly to the caller. |
* On platforms which do not support a virtual-time timer, the code |
* should probably catch EINTR returns and restart the system call. |
*/ |
|
/* |
* This macro is used for both read-type and write-type functions. |
* |
* Note: the second call to "func" may require being bracketed in a |
* cma__interrupt_disable/cma__interrupt_enable pair, but we'll |
* wait and see if this is necessary. |
*/ |
#define cma__ts_func(func,fd,arglist,type,post_process) { \ |
cma_t_integer __res__; \ |
cma_t_boolean __done__ = cma_c_false; \ |
if ((fd < 0) || (fd >= cma__g_mx_file)) return (cma__set_errno (EBADF), -1); \ |
if (!cma__is_open(fd)) return (cma__set_errno (EBADF), -1); \ |
cma__fd_reserve (fd); \ |
if (!cma__is_open(fd)) return (cma__set_errno (EBADF), -1); \ |
if (cma__issue_io_call(fd)) {\ |
if ((!cma__g_file[fd]->set_non_blocking) && \ |
(cma__g_file[fd]->non_blocking == cma_c_true)) \ |
cma__set_nonblocking(fd); \ |
cma__interrupt_disable (0); \ |
TRY { \ |
__res__ = func arglist; \ |
} \ |
CATCH_ALL { \ |
cma__interrupt_enable (0); \ |
cma__fd_unreserve (fd); \ |
RERAISE; \ |
} \ |
ENDTRY \ |
cma__interrupt_enable (0); \ |
if ((__res__ != -1) \ |
|| (!cma__is_blocking (errno)) \ |
|| (cma__g_file[fd]->user_fl.user_non_blocking)) \ |
__done__ = cma_c_true; \ |
} \ |
if (__done__) { \ |
cma__fd_unreserve (fd); \ |
} \ |
else { \ |
TRY { \ |
cma__io_prolog (type, fd); \ |
while (!__done__) { \ |
cma__io_wait (type, fd); \ |
__res__ = func arglist; \ |
if ((__res__ != -1) \ |
|| (!cma__is_blocking (errno)) \ |
|| (cma__g_file[fd]->user_fl.user_non_blocking)) \ |
__done__ = cma_c_true; \ |
} \ |
} \ |
FINALLY { \ |
cma__io_epilog (type, fd); \ |
cma__fd_unreserve (fd); \ |
} \ |
ENDTRY \ |
} \ |
if (__res__ != -1) post_process; \ |
return __res__; \ |
} |
|
/* |
* Since most CMA "thread-synchronous" I/O ("open"-type) operations on |
* U*ix follow the exact same structure, the wrapper routines have been |
* condensed into a macro. |
* |
* The steps performed are as follows: |
* 1. Issue the open function. |
* 2. If the value returned indicates an error, return it to the caller. |
* 3. If the file descriptor returned is larger than what we think is the |
* maximum value (ie if it is too big for our database) then bugcheck. |
* 4. "Open" the "file" in the CMA file database. |
* 5. Return the file descriptor value to the caller. |
* |
* FIX-ME: for the time being, if the I/O operation returns EINTR, we |
* simply return it to the caller; eventually, we should catch this |
* and "do the right thing" (if we can figure out what that is). |
*/ |
|
/* |
* This macro is used for all "open"-type functions which return a single file |
* desciptor by immediate value. |
*/ |
#define cma__ts_open(func,arglist,post_process) { \ |
int __fd__; \ |
TRY { \ |
cma__int_init (); \ |
cma__int_lock (cma__g_io_data_mutex); \ |
__fd__ = func arglist; \ |
cma__int_unlock (cma__g_io_data_mutex); \ |
if (__fd__ >= 0 && __fd__ < cma__g_mx_file) \ |
post_process; \ |
} \ |
CATCH_ALL \ |
{ \ |
cma__set_errno (EBADF); \ |
__fd__ = -1; \ |
} \ |
ENDTRY \ |
if (__fd__ >= cma__g_mx_file) \ |
cma__bugcheck ("cma__ts_open: fd is too large"); \ |
return __fd__; \ |
} |
/* |
* This macro is used for all "open"-type functions which return a pair of file |
* desciptors by reference parameter. |
*/ |
#define cma__ts_open2(func,fdpair,arglist,post_process) { \ |
int __res__; \ |
TRY { \ |
cma__int_init (); \ |
cma__int_lock (cma__g_io_data_mutex); \ |
__res__ = func arglist; \ |
cma__int_unlock (cma__g_io_data_mutex); \ |
if (__res__ >= 0 && fdpair[0] < cma__g_mx_file \ |
&& fdpair[1] < cma__g_mx_file) \ |
post_process; \ |
} \ |
CATCH_ALL \ |
{ \ |
cma__set_errno (EBADF); \ |
__res__ = -1; \ |
} \ |
ENDTRY \ |
if ((fdpair[0] >= cma__g_mx_file) || (fdpair[1] >= cma__g_mx_file)) \ |
cma__bugcheck ("cma__ts_open2: one of fd's is too large"); \ |
return __res__; \ |
} |
|
/* |
* INTERNAL INTERFACES |
*/ |
extern void cma__close_general (int); |
|
extern void cma__init_thread_io (void); |
|
extern cma_t_boolean cma__io_available (cma__t_io_type,int,struct timeval *); |
|
extern void cma__io_epilog (cma__t_io_type,int); |
|
extern void cma__io_prolog (cma__t_io_type,int); |
|
extern void cma__io_wait (cma__t_io_type,int); |
|
extern void cma__open_general (int); |
|
extern void cma__reinit_thread_io (int); |
|
extern void cma__set_nonblocking (int); |
|
extern void cma__set_user_nonblock_flags (int,int); |
|
extern cma_t_boolean cma__is_open (int); |
|
|
#endif |
cma_thread_io.h
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