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sys.c
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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1996-2024. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
/*
* system-dependent functions
*
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "sys.h"
#include "erl_osenv.h"
#include "erl_alloc.h"
#include "erl_sys_driver.h"
#include "global.h"
#include "erl_threads.h"
#include "erl_cpu_topology.h"
#include <malloc.h>
#if defined(__WIN32__) && !defined(WINDOWS_H_INCLUDES_WINSOCK2_H)
#include <winsock2.h>
#endif
void erts_sys_init_float(void);
void erl_start(int, char**);
void erts_exit(int n, const char*, ...);
void erl_error(const char*, va_list);
UWord sys_page_size;
UWord sys_large_page_size;
/*
* Microsoft-specific function to map a WIN32 error code to a Posix errno.
*/
extern void _dosmaperr(DWORD);
#ifdef ERL_RUN_SHARED_LIB
#ifdef __argc
#undef __argc
#endif
#define __argc e_argc
#ifdef __argv
#undef __argv
#endif
#define __argv e_argv
#endif
typedef struct driver_data DriverData;
static void init_console();
static int get_and_remove_option(int* argc, char** argv, const char* option);
static char *get_and_remove_option2(int *argc, char **argv,
const char *option);
static int init_async_io(DriverData *dp, struct async_io* aio, int use_threads);
static void release_async_io(struct async_io* aio, ErlDrvPort);
static void async_read_file(struct async_io* aio, LPVOID buf, DWORD numToRead);
static int async_write_file(struct async_io* aio, LPVOID buf, DWORD numToWrite);
static int get_overlapped_result(struct async_io* aio,
LPDWORD pBytesRead, BOOL wait);
static BOOL create_child_process(wchar_t *, HANDLE, HANDLE,
HANDLE, LPHANDLE, LPDWORD, BOOL,
LPVOID, wchar_t*, unsigned,
wchar_t **, int *);
static int create_pipe(LPHANDLE, LPHANDLE, BOOL, BOOL);
static int application_type(const wchar_t* originalName, wchar_t fullPath[MAX_PATH],
BOOL search_in_path, BOOL handle_quotes,
int *error_return);
static void *build_env_block(const erts_osenv_t *env);
HANDLE erts_service_event;
static erts_tsd_key_t win32_errstr_key;
static erts_atomic_t pipe_creation_counter;
/* Results from application_type(_w) is one of */
#define APPL_NONE 0
#define APPL_DOS 1
#define APPL_WIN3X 2
#define APPL_WIN32 3
static int driver_write(long, HANDLE, byte*, int);
static int create_file_thread(struct async_io* aio, int mode);
static void close_active_handle(DriverData *, HANDLE handle);
static DWORD WINAPI threaded_handle_closer(LPVOID param);
static DWORD WINAPI threaded_reader(LPVOID param);
static DWORD WINAPI threaded_writer(LPVOID param);
static DWORD WINAPI threaded_exiter(LPVOID param);
#ifdef DEBUG
static void debug_console(void);
#endif
BOOL WINAPI ctrl_handler(DWORD dwCtrlType);
#define PORT_BUFSIZ 4096
#define DRV_BUF_ALLOC(SZ) \
erts_alloc_fnf(ERTS_ALC_T_DRV_DATA_BUF, (SZ))
#define DRV_BUF_REALLOC(P, SZ) \
erts_realloc_fnf(ERTS_ALC_T_DRV_DATA_BUF, (P), (SZ))
#define DRV_BUF_FREE(P) \
erts_free(ERTS_ALC_T_DRV_DATA_BUF, (P))
/********************* General functions ****************************/
/*
* Whether create_pipe() should use a named pipe or an anonymous.
* (Named pipes are not supported on Windows 95.)
*/
static int max_files = 1024;
static DWORD dwOriginalOutMode = 0;
static DWORD dwOriginalInMode = 0;
static DWORD dwOriginalErrMode = 0;
static BOOL use_named_pipes;
static OSVERSIONINFO int_os_version; /* Version information for Win32. */
/*#define USE_CANCELIOEX
Disabled the use of CancelIoEx as its been seen to cause problem with some
drivers. Not sure what to blame; faulty drivers or some form of invalid use.
*/
#if defined(USE_CANCELIOEX)
static BOOL (WINAPI *fpCancelIoEx)(HANDLE,LPOVERLAPPED);
#endif
/* This is the system's main function (which may or may not be called "main")
- do general system-dependent initialization
- call erl_start() to parse arguments and do other init
*/
static erts_atomic_t sys_misc_mem_sz;
HMODULE beam_module = NULL;
void erl_sys_init();
void erl_sys_args(int* argc, char** argv);
int nohup;
#ifndef __GNUC__
void erts_sys_invalid_parameter_handler(const wchar_t * expression,
const wchar_t * function,
const wchar_t * file,
unsigned int line,
uintptr_t pReserved
)
{
#ifdef DEBUG
fprintf(stderr,
"Debug: Invalid parameter\"%ls\" "
"(detected in \"%ls\" [%ls:%d]) \n",
(expression) ? expression : L"(unknown)",
(function) ? function : L"(unknown)",
(file) ? file : L"(unknown)",
line);
#endif
return;
}
#endif
void sys_primitive_init(HMODULE beam)
{
#ifndef __GNUC__
/* Initialize this module handle (the beam.dll module handle) and
take care of the standard library's aggressive invalid parameter
handling... */
_set_invalid_parameter_handler(&erts_sys_invalid_parameter_handler);
#endif
beam_module = (HMODULE) beam;
}
static UWord
get_page_size(void)
{
SYSTEM_INFO info;
GetSystemInfo(&info);
return (UWord)info.dwPageSize;
}
static UWord
get_large_page_size(void)
{
return 0;
}
Uint
erts_sys_misc_mem_sz(void)
{
Uint res = (Uint) erts_check_io_size();
res += (Uint) erts_atomic_read_mb(&sys_misc_mem_sz);
return res;
}
/*
* Reset the terminal to the original settings on exit
*/
void sys_tty_reset(int exit_code)
{
SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), dwOriginalInMode);
SetConsoleMode(GetStdHandle(STD_OUTPUT_HANDLE), dwOriginalOutMode);
SetConsoleMode(GetStdHandle(STD_ERROR_HANDLE), dwOriginalErrMode);
}
void erl_sys_args(int* argc, char** argv)
{
char *event_name;
erts_sys_env_init();
nohup = get_and_remove_option(argc, argv, "-nohup");
#ifdef DEBUG
/*
* Start a debug console if -console option given.
*/
if (get_and_remove_option(argc, argv, "-console")) {
debug_console();
}
#endif
if (nohup && (event_name = get_and_remove_option2(argc, argv,
"-service_event"))) {
if ((erts_service_event =
OpenEvent(EVENT_ALL_ACCESS,FALSE,event_name)) == NULL) {
erts_fprintf(stderr,
"Warning: could not open service event: %s\r\n",
event_name);
}
} else {
erts_service_event = NULL;
}
#ifdef DEBUG
/*
* Given the "-threads" option, always use threads instead of
* named pipes.
*/
if (get_and_remove_option(argc, argv, "-threads")) {
use_named_pipes = FALSE;
}
#endif
}
/*
* Function returns 1 if we can read from all values in between
* start and stop.
*/
int
erts_sys_is_area_readable(char *start, char *stop) {
volatile char tmp;
__try
{
while(start < stop) {
tmp = *start;
start++;
}
}
__except(EXCEPTION_EXECUTE_HANDLER)
{
return 0;
}
return 1;
}
int erts_sys_prepare_crash_dump(int secs)
{
Port *heart_port;
Eterm heap[3];
Eterm *hp = heap;
Eterm list = NIL;
heart_port = erts_get_heart_port();
if (heart_port) {
list = CONS(hp, make_small(8), list); hp += 2;
/* send to heart port, CMD = 8, i.e. prepare crash dump =o */
erts_port_output(NULL, ERTS_PORT_SIG_FLG_FORCE_IMM_CALL, heart_port,
heart_port->common.id, list, NULL);
return 1;
}
/* Windows - free file descriptors are hopefully available */
/* Alarm not used on windows */
return 0;
}
int erts_set_signal(Eterm signal, Eterm type) {
return 0;
}
static void
init_console(void)
{
GetConsoleMode(GetStdHandle(STD_OUTPUT_HANDLE), &dwOriginalOutMode);
GetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), &dwOriginalInMode);
GetConsoleMode(GetStdHandle(STD_ERROR_HANDLE), &dwOriginalErrMode);
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stderr, NULL, _IONBF, 0);
}
int sys_max_files(void)
{
return max_files;
}
/*
* Looks for the given option in the argv vector. If it is found,
* it will be removed from the argv vector.
*
* If the return value indicates that the option was found and removed,
* it is the responsibility of the caller to decrement the value of argc.
*
* Returns: 0 if the option wasn't found, 1 if it was found
*/
static int
get_and_remove_option(int* argc, char* argv[], const char *option)
{
int i;
for (i = 1; i < *argc; i++) {
if (strcmp(argv[i], option) == 0) {
(*argc)--;
while (i < *argc) {
argv[i] = argv[i+1];
i++;
}
argv[i] = NULL;
return 1;
}
}
return 0;
}
static char *get_and_remove_option2(int *argc, char **argv,
const char *option)
{
char *ret;
int i;
for (i = 1; i < *argc; i++) {
if (strcmp(argv[i], option) == 0) {
if (i+1 < *argc) {
ret = argv[i+1];
(*argc) -= 2;
while (i < *argc) {
argv[i] = argv[i+2];
i++;
}
argv[i] = NULL;
return ret;
}
}
}
return NULL;
}
/************************** OS info *******************************/
/* Used by erlang:info/1. */
/* (This code was formerly in drv.XXX/XXX_os_drv.c) */
char os_type[] = "win32";
void
os_flavor(char *namebuf, unsigned size)
{
switch (int_os_version.dwPlatformId) {
case VER_PLATFORM_WIN32_WINDOWS:
strcpy(namebuf, "windows");
break;
case VER_PLATFORM_WIN32_NT:
strcpy(namebuf, "nt");
break;
default: /* Can't happen. */
strcpy(namebuf, "unknown");
break;
}
}
void
os_version(pMajor, pMinor, pBuild)
int* pMajor; /* Pointer to major version. */
int* pMinor; /* Pointer to minor version. */
int* pBuild; /* Pointer to build number. */
{
*pMajor = int_os_version.dwMajorVersion;
*pMinor = int_os_version.dwMinorVersion;
*pBuild = int_os_version.dwBuildNumber;
}
/************************** Port I/O *******************************/
/* I. Common stuff */
/* II. The spawn/fd drivers */
/*
* Definitions for driver flags.
*/
#define DF_OVR_READY 1 /* Overlapped result is ready. */
#define DF_EXIT_THREAD 2 /* The thread should exit. */
#define DF_XLAT_CR 4 /* The thread should translate CRs. */
#define DF_DROP_IF_INVH 8 /* Drop packages instead of crash if
invalid handle (stderr) */
#define DF_THREAD_FLUSHED 16 /* The thread should exit. */
#define OV_BUFFER_PTR(dp) ((LPVOID) ((dp)->ov.Internal))
#define OV_NUM_TO_READ(dp) ((dp)->ov.InternalHigh)
/*
* This data is used to make overlapped I/O operations work on both
* Windows NT (using true overlapped I/O) and Windows 95 (using threads).
*/
typedef struct async_io {
unsigned flags; /* Driver flags, definitions found above. */
HANDLE thread; /* If -1, overlapped I/O is used (Windows NT).
* Otherwise, it is the handle of the thread used
* for simulating overlapped I/O (Windows 95 and
* the console for Windows NT).
*/
HANDLE fd; /* Handle for file or pipe. */
int async_io_active; /* if true, a close of the file will signal the event in ov */
OVERLAPPED ov; /* Control structure for overlapped reading.
* When overlapped reading is simulated with
* a thread, the fields are used as follows:
* ov.Internal - Read buffer.
* ov.InternalHigh - Number of bytes to read.
* See macros above.
*/
HANDLE ioAllowed; /* The thread will wait for this event
* before starting a new read or write.
*/
HANDLE flushEvent; /* Used to signal that a flush should be done. */
HANDLE flushReplyEvent; /* Used to signal that a flush has been done. */
DWORD pendingError; /* Used to delay presentating an error to Erlang
* until the check_io function is entered.
*/
DWORD bytesTransferred; /* Bytes read or write in the last operation.
* Valid only when DF_OVR_READY is set.
*/
DriverData *dp; /* Pointer to driver data struct which
this struct is part of */
} AsyncIo;
/*
* Input thread for fd_driver (if fd_driver is running).
*/
static AsyncIo* fd_driver_input = NULL;
static BOOL (WINAPI *fpSetHandleInformation)(HANDLE,DWORD,DWORD);
/*
* This data is used by the spawn drivers.
* There will be one entry for each port, even if the input
* and output HANDLES are different. Since handles are not
* guaranteed to be small numbers in Win32, we cannot index
* with them. I.e. the index for each entry is not equal to
* none of the file handles.
*/
struct driver_data {
int totalNeeded; /* Total number of bytes needed to fill
* up the packet header or packet. */
int bytesInBuffer; /* Number of bytes read so far in
* the input buffer.
*/
int inBufSize; /* Size of input buffer. */
byte *inbuf; /* Buffer to use for overlapped read. */
int outBufSize; /* Size of output buffer. */
byte *outbuf; /* Buffer to use for overlapped write. */
ErlDrvPort port_num; /* The port handle. */
int packet_bytes; /* 0: continuous stream, 1, 2, or 4: the number
* of bytes in the packet header.
*/
HANDLE port_pid; /* PID of the port process. */
AsyncIo in; /* Control block for overlapped reading. */
AsyncIo out; /* Control block for overlapped writing. */
int report_exit; /* Do report exit status for the port */
erts_atomic32_t refc; /* References to this struct */
ErlDrvSizeT high_watermark; /* Q size when to go to busy port state */
ErlDrvSizeT low_watermark; /* Q size when to leave busy port state */
int busy;
};
/* Driver interfaces */
static ErlDrvData spawn_start(ErlDrvPort, char*, SysDriverOpts*);
static ErlDrvData fd_start(ErlDrvPort, char*, SysDriverOpts*);
static int spawn_init(void);
static int fd_init(void);
static void fd_stop(ErlDrvData);
static void stop(ErlDrvData);
static void output(ErlDrvData, char*, ErlDrvSizeT);
static void ready_input(ErlDrvData, ErlDrvEvent);
static void ready_output(ErlDrvData, ErlDrvEvent);
static void stop_select(ErlDrvEvent, void*);
struct erl_drv_entry spawn_driver_entry = {
spawn_init,
spawn_start,
stop,
output,
ready_input,
ready_output,
"spawn",
NULL, /* finish */
NULL, /* handle */
NULL, /* control */
NULL, /* timeout */
NULL, /* outputv */
NULL, /* ready_async */
NULL, /* flush */
NULL, /* call */
NULL, /* event */
ERL_DRV_EXTENDED_MARKER,
ERL_DRV_EXTENDED_MAJOR_VERSION,
ERL_DRV_EXTENDED_MINOR_VERSION,
0, /* ERL_DRV_FLAGs */
NULL,
NULL, /* process_exit */
stop_select
};
#ifdef HARD_POLL_DEBUG
extern void poll_debug_set_active_fd(ErtsSysFdType fd);
extern void poll_debug_read_begin(ErtsSysFdType fd);
extern void poll_debug_read_done(ErtsSysFdType fd, int bytes);
extern void poll_debug_async_initialized(ErtsSysFdType fd);
extern void poll_debug_async_immediate(ErtsSysFdType fd, int bytes);
extern void poll_debug_write_begin(ErtsSysFdType fd);
extern void poll_debug_write_done(ErtsSysFdType fd, int bytes);
#endif
extern int null_func(void);
struct erl_drv_entry fd_driver_entry = {
fd_init,
fd_start,
fd_stop,
output,
ready_input,
ready_output,
"fd",
NULL, /* finish */
NULL, /* handle */
NULL, /* control */
NULL, /* timeout */
NULL, /* outputv */
NULL, /* ready_async */
NULL, /* flush */
NULL, /* call */
NULL, /* event */
ERL_DRV_EXTENDED_MARKER,
ERL_DRV_EXTENDED_MAJOR_VERSION,
ERL_DRV_EXTENDED_MINOR_VERSION,
0, /* ERL_DRV_FLAGs */
NULL,
NULL, /* process_exit */
stop_select
};
static ERTS_INLINE void
refer_driver_data(DriverData *dp)
{
#ifdef DEBUG
erts_aint32_t refc = erts_atomic32_inc_read_nob(&dp->refc);
ASSERT(refc > 1);
#else
erts_atomic32_inc_nob(&dp->refc);
#endif
}
static ERTS_INLINE void
unrefer_driver_data(DriverData *dp)
{
erts_aint32_t refc = erts_atomic32_dec_read_mb(&dp->refc);
ASSERT(refc >= 0);
if (refc == 0)
driver_free(dp);
}
/*
* Initialises a DriverData structure.
*
* Results: Returns a pointer to a DriverData structure, or NULL
* if the initialsation failed.
*/
static DriverData*
new_driver_data(ErlDrvPort port_num, int packet_bytes, int wait_objs_required, int use_threads)
{
DriverData* dp;
DEBUGF(("new_driver_data(%p, pb %d)\n", port_num, packet_bytes));
dp = driver_alloc(sizeof(DriverData));
if (!dp)
return NULL;
/*
* We used to test first at all that there is enough room in the
* array used by WaitForMultipleObjects(), but that is not necessary
* any more, since driver_select() can't fail.
*/
erts_atomic32_init_nob(&dp->refc, 1);
dp->bytesInBuffer = 0;
dp->totalNeeded = packet_bytes;
dp->inBufSize = PORT_BUFSIZ;
dp->inbuf = DRV_BUF_ALLOC(dp->inBufSize);
if (dp->inbuf == NULL)
goto buf_alloc_error;
erts_atomic_add_nob(&sys_misc_mem_sz, dp->inBufSize);
dp->outBufSize = 0;
dp->outbuf = NULL;
dp->port_num = port_num;
dp->packet_bytes = packet_bytes;
dp->port_pid = INVALID_HANDLE_VALUE;
if (init_async_io(dp, &dp->in, use_threads) == -1)
goto async_io_error1;
if (init_async_io(dp, &dp->out, use_threads) == -1)
goto async_io_error2;
return dp;
async_io_error2:
release_async_io(&dp->in, dp->port_num);
async_io_error1:
release_async_io(&dp->out, dp->port_num);
buf_alloc_error:
driver_free(dp);
return NULL;
}
static void
release_driver_data(DriverData* dp)
{
#ifdef USE_CANCELIOEX
if (fpCancelIoEx != NULL) {
if (dp->in.thread == (HANDLE) -1 && dp->in.fd != INVALID_HANDLE_VALUE) {
(*fpCancelIoEx)(dp->in.fd, NULL);
}
if (dp->out.thread == (HANDLE) -1 && dp->out.fd != INVALID_HANDLE_VALUE) {
(*fpCancelIoEx)(dp->out.fd, NULL);
}
}
else
#endif
{
/* This is a workaround for the fact that CancelIo can't cancel
requests issued by another thread and that we can't use
CancelIoEx as that's only available in Vista etc.
R14: Avoid scheduler deadlock by only wait for 10ms, and then spawn
a thread that will keep waiting in order to close handles. */
HANDLE handles[2];
int i = 0;
int timeout = 10;
if(dp->in.async_io_active && dp->in.fd != INVALID_HANDLE_VALUE) {
CloseHandle(dp->in.fd);
dp->in.fd = INVALID_HANDLE_VALUE;
DEBUGF(("Waiting for the in event thingie"));
if (WaitForSingleObject(dp->in.ov.hEvent,timeout) == WAIT_TIMEOUT) {
close_active_handle(dp, dp->in.ov.hEvent);
dp->in.ov.hEvent = NULL;
timeout = 0;
}
DEBUGF(("...done\n"));
}
if(dp->out.async_io_active && dp->out.fd != INVALID_HANDLE_VALUE) {
CloseHandle(dp->out.fd);
dp->out.fd = INVALID_HANDLE_VALUE;
DEBUGF(("Waiting for the out event thingie"));
if (WaitForSingleObject(dp->out.ov.hEvent,timeout) == WAIT_TIMEOUT) {
close_active_handle(dp, dp->out.ov.hEvent);
dp->out.ov.hEvent = NULL;
}
DEBUGF(("...done\n"));
}
}
if (dp->inbuf != NULL) {
ASSERT(erts_atomic_read_nob(&sys_misc_mem_sz) >= dp->inBufSize);
erts_atomic_add_nob(&sys_misc_mem_sz, -1*dp->inBufSize);
DRV_BUF_FREE(dp->inbuf);
dp->inBufSize = 0;
dp->inbuf = NULL;
}
ASSERT(dp->inBufSize == 0);
/* outbuf is released when queue is released */
ASSERT(!dp->outbuf);
ASSERT(dp->outBufSize == 0);
if (dp->port_pid != INVALID_HANDLE_VALUE) {
CloseHandle(dp->port_pid);
dp->port_pid = INVALID_HANDLE_VALUE;
}
release_async_io(&dp->in, dp->port_num);
release_async_io(&dp->out, dp->port_num);
/*
* This must be last, because this function might be executed from
* the exit thread.
*/
unrefer_driver_data(dp);
}
struct handles_to_be_closed {
HANDLE handles[MAXIMUM_WAIT_OBJECTS];
DriverData *drv_data[MAXIMUM_WAIT_OBJECTS];
unsigned cnt;
};
static struct handles_to_be_closed* htbc_curr = NULL;
CRITICAL_SECTION htbc_lock;
static void close_active_handle(DriverData *dp, HANDLE handle)
{
struct handles_to_be_closed* htbc;
int i;
EnterCriticalSection(&htbc_lock);
htbc = htbc_curr;
if (htbc == NULL || htbc->cnt >= MAXIMUM_WAIT_OBJECTS) {
DWORD tid;
HANDLE thread;
htbc = (struct handles_to_be_closed*) erts_alloc(ERTS_ALC_T_DRV_TAB,
sizeof(*htbc));
htbc->handles[0] = CreateAutoEvent(FALSE);
htbc->drv_data[0] = NULL;
htbc->cnt = 1;
thread = (HANDLE *) _beginthreadex(NULL, 0, threaded_handle_closer, htbc, 0, &tid);
CloseHandle(thread);
}
i = htbc->cnt++;
htbc->handles[i] = handle;
htbc->drv_data[i] = dp;
if (dp)
refer_driver_data(dp); /* Need to keep driver data until we have
closed the event; outstanding operation
might write into it.. */
SetEvent(htbc->handles[0]);
htbc_curr = htbc;
LeaveCriticalSection(&htbc_lock);
}
static DWORD WINAPI
threaded_handle_closer(LPVOID param)
{
struct handles_to_be_closed* htbc = (struct handles_to_be_closed*) param;
unsigned ix;
DWORD res;
DEBUGF(("threaded_handle_closer %p started\r\n", htbc));
EnterCriticalSection(&htbc_lock);
for (;;) {
{
HANDLE* handles = htbc->handles;
unsigned cnt = htbc->cnt;
DWORD timeout = (htbc == htbc_curr) ? INFINITE : 10*1000;
LeaveCriticalSection(&htbc_lock);
DEBUGF(("threaded_handle_closer %p waiting for %d handles\r\n", htbc, cnt));
res = WaitForMultipleObjects(cnt, handles, FALSE, timeout);
}
EnterCriticalSection(&htbc_lock);
switch (res) {
case WAIT_OBJECT_0:
case WAIT_TIMEOUT:
break; /* got some more handles to wait for maybe */
default:
ix = res - WAIT_OBJECT_0;
if (ix > 0 && ix < htbc->cnt) {
int move_ix;
CloseHandle(htbc->handles[ix]);
if (htbc->drv_data[ix])
unrefer_driver_data(htbc->drv_data[ix]);
move_ix = --htbc->cnt;
htbc->handles[ix] = htbc->handles[move_ix];
htbc->drv_data[ix] = htbc->drv_data[move_ix];
}
}
if (htbc != htbc_curr) {
if (htbc->cnt == 1) { /* no real handles left */
break;
}
/* The thread with most free slots will be "current" */
if (htbc->cnt < htbc_curr->cnt) {
htbc_curr = htbc;
DEBUGF(("threaded_handle_closer %p made current\r\n", htbc));
}
}
}
LeaveCriticalSection(&htbc_lock);
CloseHandle(htbc->handles[0]);
ASSERT(!htbc->drv_data[0]);
erts_free(ERTS_ALC_T_DRV_TAB, htbc);
DEBUGF(("threaded_handle_closer %p terminating\r\n", htbc));
return 0;
}
/*
* Stores input and output file descriptors in the DriverData structure,
* and calls driver_select().
*
* This function fortunately can't fail!
*/
static ErlDrvData
set_driver_data(DriverData* dp, HANDLE ifd, HANDLE ofd, int read_write, int report_exit,
SysDriverOpts* opts)
{
int result;
dp->in.fd = ifd;
dp->out.fd = ofd;
dp->report_exit = report_exit;
dp->high_watermark = opts->high_watermark;
dp->low_watermark = opts->low_watermark;
dp->busy = 0;
if (read_write & DO_READ) {
result = driver_select(dp->port_num, (ErlDrvEvent)dp->in.ov.hEvent,
ERL_DRV_READ|ERL_DRV_USE, 1);
ASSERT(result != -1);
async_read_file(&dp->in, dp->inbuf, dp->inBufSize);
}
if (read_write & DO_WRITE) {
result = driver_select(dp->port_num, (ErlDrvEvent)dp->out.ov.hEvent,
ERL_DRV_WRITE|ERL_DRV_USE, 1);
ASSERT(result != -1);
}
/* Get "input" from process handle when it exits. */
if (dp->report_exit && dp->port_pid != INVALID_HANDLE_VALUE) {
result = driver_select(dp->port_num, (ErlDrvEvent)dp->port_pid,
ERL_DRV_READ|ERL_DRV_USE, 1);
ASSERT(result != -1);
}
return (ErlDrvData) dp;
}
static ErlDrvData
reuse_driver_data(DriverData *dp, HANDLE ifd, HANDLE ofd, int read_write, ErlDrvPort port_num)
{
int result;
dp->port_num = port_num;
dp->in.fd = ifd;
dp->out.fd = ofd;
dp->report_exit = 0;
if (read_write & DO_READ) {
result = driver_select(dp->port_num, (ErlDrvEvent)dp->in.ov.hEvent,
ERL_DRV_READ|ERL_DRV_USE, 1);
ASSERT(result != -1);
}
if (read_write & DO_WRITE) {
result = driver_select(dp->port_num, (ErlDrvEvent)dp->out.ov.hEvent,
ERL_DRV_WRITE|ERL_DRV_USE, 1);
ASSERT(result != -1);
}
return (ErlDrvData) dp;
}
/*
* Initialises an AsyncIo structure.
*/
static int
init_async_io(DriverData *dp, AsyncIo* aio, int use_threads)
{
aio->dp = dp;
aio->flags = 0;
aio->thread = (HANDLE) -1;
aio->fd = INVALID_HANDLE_VALUE;
aio->ov.hEvent = NULL;
aio->ov.Offset = 0L;
aio->ov.OffsetHigh = 0L;
aio->ioAllowed = NULL;
aio->flushEvent = NULL;
aio->flushReplyEvent = NULL;
aio->pendingError = 0;
aio->bytesTransferred = 0;
aio->async_io_active = 0;
aio->ov.hEvent = CreateManualEvent(FALSE);
if (aio->ov.hEvent == NULL)
return -1;
if (use_threads) {
OV_BUFFER_PTR(aio) = NULL;
OV_NUM_TO_READ(aio) = 0;
aio->ioAllowed = CreateAutoEvent(FALSE);
if (aio->ioAllowed == NULL)
return -1;
aio->flushEvent = CreateAutoEvent(FALSE);
if (aio->flushEvent == NULL)
return -1;
aio->flushReplyEvent = CreateAutoEvent(FALSE);
if (aio->flushReplyEvent == NULL)
return -1;
}
return 0;
}
/*
* Releases everything allocated in an AsyncIo structure.
*/
static void
release_async_io(AsyncIo* aio, ErlDrvPort port_num)
{
aio->flags = 0;
if (aio->thread != (HANDLE) -1)
CloseHandle(aio->thread);
aio->thread = (HANDLE) -1;
if (aio->fd != INVALID_HANDLE_VALUE)
CloseHandle(aio->fd);
aio->fd = INVALID_HANDLE_VALUE;
if (aio->ov.hEvent != NULL)
CloseHandle(aio->ov.hEvent);
aio->ov.hEvent = NULL;
if (aio->ioAllowed != NULL)
CloseHandle(aio->ioAllowed);
aio->ioAllowed = NULL;
if (aio->flushEvent != NULL)
CloseHandle(aio->flushEvent);
aio->flushEvent = NULL;
if (aio->flushReplyEvent != NULL)
CloseHandle(aio->flushReplyEvent);
aio->flushReplyEvent = NULL;
}
/* ----------------------------------------------------------------------
* async_read_file --
* Initiaties an asynchronous file read, or simulates that using
* the thread associated with this driver data. To get the results,
* call get_overlapped_result().
*
* Results:
* None.
* ----------------------------------------------------------------------
*/
static void
async_read_file(AsyncIo* aio, LPVOID buf, DWORD numToRead)
{
aio->pendingError = NO_ERROR;
#ifdef HARD_POLL_DEBUG
poll_debug_async_initialized(aio->ov.hEvent);
#endif
if (aio->thread != (HANDLE) -1) {
DEBUGF(("async_read_file: signaling thread 0x%x, event 0x%x\n",
aio->thread, aio->ioAllowed));
OV_BUFFER_PTR(aio) = buf;
OV_NUM_TO_READ(aio) = numToRead;
ResetEvent(aio->ov.hEvent);