am ce48083f: Fixes ADB crash on Windows due to large number of connections. do not merge.
* commit 'ce48083fc90cee807dd66608e2c3e496145af9ff': Fixes ADB crash on Windows due to large number of connections. do not merge.
This commit is contained in:
Vladimir Chtchetkine
Android Git Automerger
commit
7ca9e279ca
1 changed files with 190 additions and 15 deletions
|
|
@ -352,7 +352,7 @@ int adb_open(const char* path, int options)
|
|||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
snprintf( f->name, sizeof(f->name), "%d(%s)", _fh_to_int(f), path );
|
||||
D( "adb_open: '%s' => fd %d\n", path, _fh_to_int(f) );
|
||||
return _fh_to_int(f);
|
||||
|
|
@ -837,7 +837,7 @@ static void bip_dump_hex( const unsigned char* ptr, size_t len )
|
|||
|
||||
if (len2 > 8) len2 = 8;
|
||||
|
||||
for (nn = 0; nn < len2; nn++)
|
||||
for (nn = 0; nn < len2; nn++)
|
||||
printf("%02x", ptr[nn]);
|
||||
printf(" ");
|
||||
|
||||
|
|
@ -994,7 +994,7 @@ Exit:
|
|||
SetEvent( bip->evt_read );
|
||||
}
|
||||
|
||||
BIPD(( "bip_buffer_write: exit %d->%d count %d (as=%d ae=%d be=%d cw=%d cr=%d\n",
|
||||
BIPD(( "bip_buffer_write: exit %d->%d count %d (as=%d ae=%d be=%d cw=%d cr=%d\n",
|
||||
bip->fdin, bip->fdout, count, bip->a_start, bip->a_end, bip->b_end, bip->can_write, bip->can_read ));
|
||||
LeaveCriticalSection( &bip->lock );
|
||||
|
||||
|
|
@ -1018,7 +1018,7 @@ bip_buffer_read( BipBuffer bip, void* dst, int len )
|
|||
LeaveCriticalSection( &bip->lock );
|
||||
errno = EAGAIN;
|
||||
return -1;
|
||||
#else
|
||||
#else
|
||||
int ret;
|
||||
LeaveCriticalSection( &bip->lock );
|
||||
|
||||
|
|
@ -1087,14 +1087,14 @@ Exit:
|
|||
}
|
||||
|
||||
BIPDUMP( (const unsigned char*)dst - count, count );
|
||||
BIPD(( "bip_buffer_read: exit %d->%d count %d (as=%d ae=%d be=%d cw=%d cr=%d\n",
|
||||
BIPD(( "bip_buffer_read: exit %d->%d count %d (as=%d ae=%d be=%d cw=%d cr=%d\n",
|
||||
bip->fdin, bip->fdout, count, bip->a_start, bip->a_end, bip->b_end, bip->can_write, bip->can_read ));
|
||||
LeaveCriticalSection( &bip->lock );
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
typedef struct SocketPairRec_
|
||||
typedef struct SocketPairRec_
|
||||
{
|
||||
BipBufferRec a2b_bip;
|
||||
BipBufferRec b2a_bip;
|
||||
|
|
@ -1400,7 +1400,7 @@ event_looper_hook( EventLooper looper, int fd, int events )
|
|||
f->clazz->_fh_hook( f, events & ~node->wanted, node );
|
||||
node->wanted |= events;
|
||||
} else {
|
||||
D("event_looper_hook: ignoring events %x for %d wanted=%x)\n",
|
||||
D("event_looper_hook: ignoring events %x for %d wanted=%x)\n",
|
||||
events, fd, node->wanted);
|
||||
}
|
||||
}
|
||||
|
|
@ -1426,6 +1426,180 @@ event_looper_unhook( EventLooper looper, int fd, int events )
|
|||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* A fixer for WaitForMultipleObjects on condition that there are more than 64
|
||||
* handles to wait on.
|
||||
*
|
||||
* In cetain cases DDMS may establish more than 64 connections with ADB. For
|
||||
* instance, this may happen if there are more than 64 processes running on a
|
||||
* device, or there are multiple devices connected (including the emulator) with
|
||||
* the combined number of running processes greater than 64. In this case using
|
||||
* WaitForMultipleObjects to wait on connection events simply wouldn't cut,
|
||||
* because of the API limitations (64 handles max). So, we need to provide a way
|
||||
* to scale WaitForMultipleObjects to accept an arbitrary number of handles. The
|
||||
* easiest (and "Microsoft recommended") way to do that would be dividing the
|
||||
* handle array into chunks with the chunk size less than 64, and fire up as many
|
||||
* waiting threads as there are chunks. Then each thread would wait on a chunk of
|
||||
* handles, and will report back to the caller which handle has been set.
|
||||
* Here is the implementation of that algorithm.
|
||||
*/
|
||||
|
||||
/* Number of handles to wait on in each wating thread. */
|
||||
#define WAIT_ALL_CHUNK_SIZE 63
|
||||
|
||||
/* Descriptor for a wating thread */
|
||||
typedef struct WaitForAllParam {
|
||||
/* A handle to an event to signal when waiting is over. This handle is shared
|
||||
* accross all the waiting threads, so each waiting thread knows when any
|
||||
* other thread has exited, so it can exit too. */
|
||||
HANDLE main_event;
|
||||
/* Upon exit from a waiting thread contains the index of the handle that has
|
||||
* been signaled. The index is an absolute index of the signaled handle in
|
||||
* the original array. This pointer is shared accross all the waiting threads
|
||||
* and it's not guaranteed (due to a race condition) that when all the
|
||||
* waiting threads exit, the value contained here would indicate the first
|
||||
* handle that was signaled. This is fine, because the caller cares only
|
||||
* about any handle being signaled. It doesn't care about the order, nor
|
||||
* about the whole list of handles that were signaled. */
|
||||
LONG volatile *signaled_index;
|
||||
/* Array of handles to wait on in a waiting thread. */
|
||||
HANDLE* handles;
|
||||
/* Number of handles in 'handles' array to wait on. */
|
||||
int handles_count;
|
||||
/* Index inside the main array of the first handle in the 'handles' array. */
|
||||
int first_handle_index;
|
||||
/* Waiting thread handle. */
|
||||
HANDLE thread;
|
||||
} WaitForAllParam;
|
||||
|
||||
/* Waiting thread routine. */
|
||||
static unsigned __stdcall
|
||||
_in_waiter_thread(void* arg)
|
||||
{
|
||||
HANDLE wait_on[WAIT_ALL_CHUNK_SIZE + 1];
|
||||
int res;
|
||||
WaitForAllParam* const param = (WaitForAllParam*)arg;
|
||||
|
||||
/* We have to wait on the main_event in order to be notified when any of the
|
||||
* sibling threads is exiting. */
|
||||
wait_on[0] = param->main_event;
|
||||
/* The rest of the handles go behind the main event handle. */
|
||||
memcpy(wait_on + 1, param->handles, param->handles_count * sizeof(HANDLE));
|
||||
|
||||
res = WaitForMultipleObjects(param->handles_count + 1, wait_on, FALSE, INFINITE);
|
||||
if (res > 0 && res < (param->handles_count + 1)) {
|
||||
/* One of the original handles got signaled. Save its absolute index into
|
||||
* the output variable. */
|
||||
InterlockedCompareExchange(param->signaled_index,
|
||||
res - 1L + param->first_handle_index, -1L);
|
||||
}
|
||||
|
||||
/* Notify the caller (and the siblings) that the wait is over. */
|
||||
SetEvent(param->main_event);
|
||||
|
||||
_endthreadex(0);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* WaitForMultipeObjects fixer routine.
|
||||
* Param:
|
||||
* handles Array of handles to wait on.
|
||||
* handles_count Number of handles in the array.
|
||||
* Return:
|
||||
* (>= 0 && < handles_count) - Index of the signaled handle in the array, or
|
||||
* WAIT_FAILED on an error.
|
||||
*/
|
||||
static int
|
||||
_wait_for_all(HANDLE* handles, int handles_count)
|
||||
{
|
||||
WaitForAllParam* threads;
|
||||
HANDLE main_event;
|
||||
int chunks, chunk, remains;
|
||||
|
||||
/* This variable is going to be accessed by several threads at the same time,
|
||||
* this is bound to fail randomly when the core is run on multi-core machines.
|
||||
* To solve this, we need to do the following (1 _and_ 2):
|
||||
* 1. Use the "volatile" qualifier to ensure the compiler doesn't optimize
|
||||
* out the reads/writes in this function unexpectedly.
|
||||
* 2. Ensure correct memory ordering. The "simple" way to do that is to wrap
|
||||
* all accesses inside a critical section. But we can also use
|
||||
* InterlockedCompareExchange() which always provide a full memory barrier
|
||||
* on Win32.
|
||||
*/
|
||||
volatile LONG sig_index = -1;
|
||||
|
||||
/* Calculate number of chunks, and allocate thread param array. */
|
||||
chunks = handles_count / WAIT_ALL_CHUNK_SIZE;
|
||||
remains = handles_count % WAIT_ALL_CHUNK_SIZE;
|
||||
threads = (WaitForAllParam*)malloc((chunks + (remains ? 1 : 0)) *
|
||||
sizeof(WaitForAllParam));
|
||||
if (threads == NULL) {
|
||||
D("Unable to allocate thread array for %d handles.", handles_count);
|
||||
return (int)WAIT_FAILED;
|
||||
}
|
||||
|
||||
/* Create main event to wait on for all waiting threads. This is a "manualy
|
||||
* reset" event that will remain set once it was set. */
|
||||
main_event = CreateEvent(NULL, TRUE, FALSE, NULL);
|
||||
if (main_event == NULL) {
|
||||
D("Unable to create main event. Error: %d", GetLastError());
|
||||
free(threads);
|
||||
return (int)WAIT_FAILED;
|
||||
}
|
||||
|
||||
/*
|
||||
* Initialize waiting thread parameters.
|
||||
*/
|
||||
|
||||
for (chunk = 0; chunk < chunks; chunk++) {
|
||||
threads[chunk].main_event = main_event;
|
||||
threads[chunk].signaled_index = &sig_index;
|
||||
threads[chunk].first_handle_index = WAIT_ALL_CHUNK_SIZE * chunk;
|
||||
threads[chunk].handles = handles + threads[chunk].first_handle_index;
|
||||
threads[chunk].handles_count = WAIT_ALL_CHUNK_SIZE;
|
||||
}
|
||||
if (remains) {
|
||||
threads[chunk].main_event = main_event;
|
||||
threads[chunk].signaled_index = &sig_index;
|
||||
threads[chunk].first_handle_index = WAIT_ALL_CHUNK_SIZE * chunk;
|
||||
threads[chunk].handles = handles + threads[chunk].first_handle_index;
|
||||
threads[chunk].handles_count = remains;
|
||||
chunks++;
|
||||
}
|
||||
|
||||
/* Start the waiting threads. */
|
||||
for (chunk = 0; chunk < chunks; chunk++) {
|
||||
/* Note that using adb_thread_create is not appropriate here, since we
|
||||
* need a handle to wait on for thread termination. */
|
||||
threads[chunk].thread = (HANDLE)_beginthreadex(NULL, 0, _in_waiter_thread,
|
||||
&threads[chunk], 0, NULL);
|
||||
if (threads[chunk].thread == NULL) {
|
||||
/* Unable to create a waiter thread. Collapse. */
|
||||
D("Unable to create a waiting thread %d of %d. errno=%d",
|
||||
chunk, chunks, errno);
|
||||
chunks = chunk;
|
||||
SetEvent(main_event);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* Wait on any of the threads to get signaled. */
|
||||
WaitForSingleObject(main_event, INFINITE);
|
||||
|
||||
/* Wait on all the waiting threads to exit. */
|
||||
for (chunk = 0; chunk < chunks; chunk++) {
|
||||
WaitForSingleObject(threads[chunk].thread, INFINITE);
|
||||
CloseHandle(threads[chunk].thread);
|
||||
}
|
||||
|
||||
CloseHandle(main_event);
|
||||
free(threads);
|
||||
|
||||
|
||||
const int ret = (int)InterlockedCompareExchange(&sig_index, -1, -1);
|
||||
return (ret >= 0) ? ret : (int)WAIT_FAILED;
|
||||
}
|
||||
|
||||
static EventLooperRec win32_looper;
|
||||
|
||||
static void fdevent_init(void)
|
||||
|
|
@ -1494,7 +1668,7 @@ static void fdevent_process()
|
|||
{
|
||||
looper->htab_count = 0;
|
||||
|
||||
for (hook = looper->hooks; hook; hook = hook->next)
|
||||
for (hook = looper->hooks; hook; hook = hook->next)
|
||||
{
|
||||
if (hook->start && !hook->start(hook)) {
|
||||
D( "fdevent_process: error when starting a hook\n" );
|
||||
|
|
@ -1525,10 +1699,11 @@ static void fdevent_process()
|
|||
|
||||
D( "adb_win32: waiting for %d events\n", looper->htab_count );
|
||||
if (looper->htab_count > MAXIMUM_WAIT_OBJECTS) {
|
||||
D("handle count %d exceeds MAXIMUM_WAIT_OBJECTS, aborting!\n", looper->htab_count);
|
||||
abort();
|
||||
D("handle count %d exceeds MAXIMUM_WAIT_OBJECTS.\n", looper->htab_count);
|
||||
wait_ret = _wait_for_all(looper->htab, looper->htab_count);
|
||||
} else {
|
||||
wait_ret = WaitForMultipleObjects( looper->htab_count, looper->htab, FALSE, INFINITE );
|
||||
}
|
||||
wait_ret = WaitForMultipleObjects( looper->htab_count, looper->htab, FALSE, INFINITE );
|
||||
if (wait_ret == (int)WAIT_FAILED) {
|
||||
D( "adb_win32: wait failed, error %ld\n", GetLastError() );
|
||||
} else {
|
||||
|
|
@ -1669,7 +1844,7 @@ void fdevent_destroy(fdevent *fde)
|
|||
fdevent_remove(fde);
|
||||
}
|
||||
|
||||
void fdevent_install(fdevent *fde, int fd, fd_func func, void *arg)
|
||||
void fdevent_install(fdevent *fde, int fd, fd_func func, void *arg)
|
||||
{
|
||||
memset(fde, 0, sizeof(fdevent));
|
||||
fde->state = FDE_ACTIVE;
|
||||
|
|
@ -1691,7 +1866,7 @@ void fdevent_remove(fdevent *fde)
|
|||
|
||||
if(fde->state & FDE_ACTIVE) {
|
||||
fdevent_disconnect(fde);
|
||||
dump_fde(fde, "disconnect");
|
||||
dump_fde(fde, "disconnect");
|
||||
fdevent_unregister(fde);
|
||||
}
|
||||
|
||||
|
|
@ -1917,7 +2092,7 @@ static void _event_socketpair_prepare( EventHook hook )
|
|||
if (hook->wanted & FDE_READ && rbip->can_read)
|
||||
hook->ready |= FDE_READ;
|
||||
|
||||
if (hook->wanted & FDE_WRITE && wbip->can_write)
|
||||
if (hook->wanted & FDE_WRITE && wbip->can_write)
|
||||
hook->ready |= FDE_WRITE;
|
||||
}
|
||||
|
||||
|
|
@ -1938,7 +2113,7 @@ static void _event_socketpair_prepare( EventHook hook )
|
|||
D("_event_socketpair_start: can't handle FDE_READ+FDE_WRITE\n" );
|
||||
return 0;
|
||||
}
|
||||
D( "_event_socketpair_start: hook %s for %x wanted=%x\n",
|
||||
D( "_event_socketpair_start: hook %s for %x wanted=%x\n",
|
||||
hook->fh->name, _fh_to_int(fh), hook->wanted);
|
||||
return 1;
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue