* When canonical input processing is enabled reads should only return
anything, if a line is available. Fixes bug #1483. * Replaced the request owner waiting semaphore by a condition variable and removed the now no longer needed SemaphorePool. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22357 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold
parent
ece77b379a
commit
2f6b4f3e1a
@ -8,6 +8,5 @@ KernelAddon <driver>tty :
|
||||
line_buffer.cpp
|
||||
master.cpp
|
||||
slave.cpp
|
||||
SemaphorePool.cpp
|
||||
;
|
||||
|
||||
|
||||
@ -1,100 +0,0 @@
|
||||
/*
|
||||
* Copyright 2005-2007, Ingo Weinhold, bonefish@users.sf.net.
|
||||
* Distributed under the terms of the MIT License.
|
||||
*/
|
||||
|
||||
#include <new>
|
||||
|
||||
#include <util/AutoLock.h>
|
||||
|
||||
#include "SemaphorePool.h"
|
||||
|
||||
|
||||
status_t
|
||||
Semaphore::ZeroCount()
|
||||
{
|
||||
int32 count;
|
||||
status_t error = get_sem_count(fSemaphore, &count);
|
||||
if (error != B_OK)
|
||||
return error;
|
||||
|
||||
if (count > 0)
|
||||
error = acquire_sem_etc(fSemaphore, count, B_RELATIVE_TIMEOUT, 0);
|
||||
else if (count < 0)
|
||||
error = release_sem_etc(fSemaphore, -count, 0);
|
||||
|
||||
return error;
|
||||
}
|
||||
|
||||
|
||||
// #pragma mark -
|
||||
|
||||
SemaphorePool::SemaphorePool(int32 maxCached)
|
||||
: fSemaphores(),
|
||||
fCount(0),
|
||||
fMaxCount(maxCached)
|
||||
{
|
||||
if (fMaxCount < 0)
|
||||
fMaxCount = 8;
|
||||
}
|
||||
|
||||
|
||||
SemaphorePool::~SemaphorePool()
|
||||
{
|
||||
while (Semaphore *sem = fSemaphores.Head()) {
|
||||
fSemaphores.Remove(sem);
|
||||
delete sem;
|
||||
}
|
||||
|
||||
mutex_destroy(&fLock);
|
||||
}
|
||||
|
||||
|
||||
status_t
|
||||
SemaphorePool::Init()
|
||||
{
|
||||
return mutex_init(&fLock, "tty semaphore pool");
|
||||
}
|
||||
|
||||
|
||||
status_t
|
||||
SemaphorePool::Get(Semaphore *&semaphore)
|
||||
{
|
||||
MutexLocker _(fLock);
|
||||
|
||||
// use a cached one, if available
|
||||
if (fCount > 0) {
|
||||
fCount--;
|
||||
semaphore = fSemaphores.Head();
|
||||
fSemaphores.Remove(semaphore);
|
||||
return B_OK;
|
||||
}
|
||||
|
||||
// create a new one
|
||||
Semaphore *sem = new(nothrow) Semaphore(0, "pool semaphore");
|
||||
if (!sem)
|
||||
return B_NO_MEMORY;
|
||||
|
||||
semaphore = sem;
|
||||
return B_OK;
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
SemaphorePool::Put(Semaphore *semaphore)
|
||||
{
|
||||
if (!semaphore)
|
||||
return;
|
||||
|
||||
MutexLocker _(fLock);
|
||||
|
||||
if (fCount >= fMaxCount
|
||||
|| semaphore->InitCheck() != B_OK
|
||||
|| semaphore->ZeroCount() != B_OK) {
|
||||
delete semaphore;
|
||||
return;
|
||||
}
|
||||
|
||||
fSemaphores.Add(semaphore);
|
||||
fCount++;
|
||||
}
|
||||
@ -1,67 +0,0 @@
|
||||
/*
|
||||
* Copyright 2005, Ingo Weinhold, bonefish@users.sf.net.
|
||||
* Distributed under the terms of the MIT License.
|
||||
*/
|
||||
#ifndef TTY_SEMAPHORE_POOL_H
|
||||
#define TTY_SEMAPHORE_POOL_H
|
||||
|
||||
#include <lock.h>
|
||||
#include <util/DoublyLinkedList.h>
|
||||
|
||||
class Semaphore : public DoublyLinkedListLinkImpl<Semaphore> {
|
||||
public:
|
||||
Semaphore(sem_id sem)
|
||||
: fSemaphore(sem)
|
||||
{
|
||||
}
|
||||
|
||||
Semaphore(int32 count, const char *name)
|
||||
{
|
||||
fSemaphore = create_sem(count, name);
|
||||
}
|
||||
|
||||
~Semaphore()
|
||||
{
|
||||
if (fSemaphore >= 0)
|
||||
delete_sem(fSemaphore);
|
||||
}
|
||||
|
||||
status_t InitCheck() const
|
||||
{
|
||||
return (fSemaphore >= 0 ? B_OK : fSemaphore);
|
||||
}
|
||||
|
||||
sem_id ID() const
|
||||
{
|
||||
return fSemaphore;
|
||||
}
|
||||
|
||||
status_t ZeroCount();
|
||||
|
||||
private:
|
||||
sem_id fSemaphore;
|
||||
|
||||
public:
|
||||
Semaphore *fNext;
|
||||
};
|
||||
|
||||
class SemaphorePool {
|
||||
public:
|
||||
SemaphorePool(int32 maxCached);
|
||||
~SemaphorePool();
|
||||
|
||||
status_t Init();
|
||||
|
||||
status_t Get(Semaphore *&semaphore);
|
||||
void Put(Semaphore *semaphore);
|
||||
|
||||
private:
|
||||
typedef DoublyLinkedList<Semaphore> SemaphoreList;
|
||||
|
||||
struct mutex fLock;
|
||||
SemaphoreList fSemaphores;
|
||||
int32 fCount;
|
||||
int32 fMaxCount;
|
||||
};
|
||||
|
||||
#endif // TTY_SEMAPHORE_POOL_H
|
||||
@ -11,7 +11,6 @@
|
||||
|
||||
#include <lock.h>
|
||||
|
||||
#include "SemaphorePool.h"
|
||||
#include "tty_private.h"
|
||||
|
||||
|
||||
@ -34,8 +33,6 @@ static char *sDeviceNames[kNumTTYs * 2 + 1];
|
||||
struct mutex gGlobalTTYLock;
|
||||
struct mutex gTTYCookieLock;
|
||||
struct recursive_lock gTTYRequestLock;
|
||||
static char sSemaphorePoolBuffer[sizeof(SemaphorePool)];
|
||||
SemaphorePool *gSemaphorePool = 0;
|
||||
|
||||
|
||||
status_t
|
||||
@ -73,15 +70,6 @@ init_driver(void)
|
||||
return error;
|
||||
}
|
||||
|
||||
// create the semaphore pool
|
||||
gSemaphorePool
|
||||
= new(sSemaphorePoolBuffer) SemaphorePool(kMaxCachedSemaphores);
|
||||
error = gSemaphorePool->Init();
|
||||
if (error != B_OK) {
|
||||
uninit_driver();
|
||||
return error;
|
||||
}
|
||||
|
||||
// create driver name array and initialize basic TTY structures
|
||||
|
||||
char letter = 'p';
|
||||
@ -124,11 +112,6 @@ uninit_driver(void)
|
||||
for (int32 i = 0; i < (int32)kNumTTYs * 2; i++)
|
||||
free(sDeviceNames[i]);
|
||||
|
||||
if (gSemaphorePool) {
|
||||
gSemaphorePool->~SemaphorePool();
|
||||
gSemaphorePool = NULL;
|
||||
}
|
||||
|
||||
recursive_lock_destroy(&gTTYRequestLock);
|
||||
mutex_destroy(&gTTYCookieLock);
|
||||
mutex_destroy(&gGlobalTTYLock);
|
||||
|
||||
@ -49,6 +49,24 @@ line_buffer_readable(struct line_buffer &buffer)
|
||||
}
|
||||
|
||||
|
||||
int32
|
||||
line_buffer_readable_line(struct line_buffer &buffer, char eol, char eof)
|
||||
{
|
||||
size_t size = buffer.in;
|
||||
if (size == 0)
|
||||
return 0;
|
||||
|
||||
// find EOL or EOF char
|
||||
for (size_t i = 0; i < size; i++) {
|
||||
char c = buffer.buffer[(buffer.first + i) % buffer.size];
|
||||
if (c == eol || c == '\n' || c == '\r' || c == eof)
|
||||
return i + 1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
int32
|
||||
line_buffer_writable(struct line_buffer &buffer)
|
||||
{
|
||||
|
||||
@ -20,6 +20,7 @@ status_t init_line_buffer(struct line_buffer &buffer, size_t size);
|
||||
status_t uninit_line_buffer(struct line_buffer &buffer);
|
||||
status_t clear_line_buffer(struct line_buffer &buffer);
|
||||
int32 line_buffer_readable(struct line_buffer &buffer);
|
||||
int32 line_buffer_readable_line(struct line_buffer &buffer, char eol, char eof);
|
||||
int32 line_buffer_writable(struct line_buffer &buffer);
|
||||
ssize_t line_buffer_user_read(struct line_buffer &buffer, char *data,
|
||||
size_t length, char eof = 0, bool* hitEOF = NULL);
|
||||
|
||||
@ -19,7 +19,6 @@
|
||||
|
||||
#include <team.h>
|
||||
|
||||
#include "SemaphorePool.h"
|
||||
#include "tty_private.h"
|
||||
|
||||
|
||||
@ -134,6 +133,7 @@ class ReaderLocker : public AbstractLocker {
|
||||
status_t AcquireReader(bool dontBlock);
|
||||
|
||||
private:
|
||||
size_t _CheckAvailableBytes() const;
|
||||
status_t _CheckBackgroundRead() const;
|
||||
|
||||
struct tty *fTTY;
|
||||
@ -295,7 +295,7 @@ RequestQueue::NotifyError(tty_cookie *cookie, status_t error)
|
||||
|
||||
RequestOwner::RequestOwner()
|
||||
:
|
||||
fSemaphore(NULL),
|
||||
fConditionVariable(NULL),
|
||||
fCookie(NULL),
|
||||
fError(B_OK),
|
||||
fBytesNeeded(1)
|
||||
@ -364,20 +364,11 @@ RequestOwner::SetBytesNeeded(size_t bytesNeeded)
|
||||
* The request lock MUST NOT be held!
|
||||
*/
|
||||
status_t
|
||||
RequestOwner::Wait(bool interruptable, Semaphore *sem)
|
||||
RequestOwner::Wait(bool interruptable)
|
||||
{
|
||||
TRACE(("%p->RequestOwner::Wait(%d, %p)\n", this, interruptable, sem));
|
||||
TRACE(("%p->RequestOwner::Wait(%d)\n", this, interruptable));
|
||||
|
||||
// get a semaphore (if not supplied or invalid)
|
||||
status_t error = B_OK;
|
||||
bool ownsSem = false;
|
||||
if (!sem || sem->InitCheck() != B_OK) {
|
||||
error = gSemaphorePool->Get(sem);
|
||||
if (error != B_OK)
|
||||
return error;
|
||||
|
||||
ownsSem = true;
|
||||
}
|
||||
|
||||
RecursiveLocker locker(gTTYRequestLock);
|
||||
|
||||
@ -386,35 +377,35 @@ RequestOwner::Wait(bool interruptable, Semaphore *sem)
|
||||
&& (!fRequests[0].WasNotified() || !fRequests[1].WasNotified())) {
|
||||
// not yet done
|
||||
|
||||
// set the semaphore
|
||||
fSemaphore = sem;
|
||||
// publish the condition variable
|
||||
ConditionVariable<> conditionVariable;
|
||||
conditionVariable.Publish(this, "tty request");
|
||||
fConditionVariable = &conditionVariable;
|
||||
|
||||
// add an entry to wait on
|
||||
ConditionVariableEntry<> entry;
|
||||
entry.Add(this);
|
||||
|
||||
locker.Unlock();
|
||||
|
||||
// wait
|
||||
TRACE(("%p->RequestOwner::Wait(): acquiring semaphore...\n", this));
|
||||
TRACE(("%p->RequestOwner::Wait(): waiting for condition...\n", this));
|
||||
|
||||
error = acquire_sem_etc(sem->ID(), 1,
|
||||
(interruptable ? B_CAN_INTERRUPT : 0), 0);
|
||||
error = entry.Wait(interruptable ? B_CAN_INTERRUPT : 0);
|
||||
|
||||
TRACE(("%p->RequestOwner::Wait(): semaphore acquired: %lx\n", this,
|
||||
TRACE(("%p->RequestOwner::Wait(): condition occurred: %lx\n", this,
|
||||
error));
|
||||
|
||||
// remove the semaphore
|
||||
locker.SetTo(gTTYRequestLock, false);
|
||||
fSemaphore = NULL;
|
||||
// remove the condition variable
|
||||
locker.Lock();
|
||||
fConditionVariable = NULL;
|
||||
conditionVariable.Unpublish();
|
||||
}
|
||||
|
||||
// get the result
|
||||
if (error == B_OK)
|
||||
error = fError;
|
||||
|
||||
locker.Unlock();
|
||||
|
||||
// return the semaphore to the pool
|
||||
if (ownsSem)
|
||||
gSemaphorePool->Put(sem);
|
||||
|
||||
return error;
|
||||
}
|
||||
|
||||
@ -439,18 +430,18 @@ RequestOwner::Notify(Request *request)
|
||||
TRACE(("%p->RequestOwner::Notify(%p)\n", this, request));
|
||||
|
||||
if (fError == B_OK && !request->WasNotified()) {
|
||||
bool releaseSem = false;
|
||||
bool notify = false;
|
||||
|
||||
if (&fRequests[0] == request) {
|
||||
releaseSem = fRequests[1].WasNotified();
|
||||
notify = fRequests[1].WasNotified();
|
||||
} else if (&fRequests[1] == request) {
|
||||
releaseSem = fRequests[0].WasNotified();
|
||||
notify = fRequests[0].WasNotified();
|
||||
} else {
|
||||
// spurious call
|
||||
}
|
||||
|
||||
if (releaseSem && fSemaphore)
|
||||
release_sem(fSemaphore->ID());
|
||||
if (notify && fConditionVariable)
|
||||
fConditionVariable->NotifyOne();
|
||||
}
|
||||
}
|
||||
|
||||
@ -464,8 +455,8 @@ RequestOwner::NotifyError(Request *request, status_t error)
|
||||
fError = error;
|
||||
|
||||
if (!fRequests[0].WasNotified() || !fRequests[1].WasNotified()) {
|
||||
if (fSemaphore)
|
||||
release_sem(fSemaphore->ID());
|
||||
if (fConditionVariable)
|
||||
fConditionVariable->NotifyOne();
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -667,7 +658,7 @@ ReaderLocker::AcquireReader(bool dontBlock)
|
||||
|
||||
// check, if we're first in queue, and if there is something to read
|
||||
if (fRequestOwner.IsFirstInQueues()) {
|
||||
fBytes = line_buffer_readable(fTTY->input_buffer);
|
||||
fBytes = _CheckAvailableBytes();
|
||||
if (fBytes > 0)
|
||||
return B_OK;
|
||||
}
|
||||
@ -686,12 +677,27 @@ ReaderLocker::AcquireReader(bool dontBlock)
|
||||
status = _CheckBackgroundRead();
|
||||
|
||||
if (status == B_OK)
|
||||
fBytes = line_buffer_readable(fTTY->input_buffer);
|
||||
fBytes = _CheckAvailableBytes();
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
|
||||
size_t
|
||||
ReaderLocker::_CheckAvailableBytes() const
|
||||
{
|
||||
// Reading from the slave with canonical input processing enabled means
|
||||
// that we read at max until hitting a line end or EOF.
|
||||
if (!fTTY->is_master && (fTTY->settings->termios.c_lflag & ICANON) != 0) {
|
||||
return line_buffer_readable_line(fTTY->input_buffer,
|
||||
fTTY->settings->termios.c_cc[VEOL],
|
||||
fTTY->settings->termios.c_cc[VEOF]);
|
||||
}
|
||||
|
||||
return line_buffer_readable(fTTY->input_buffer);
|
||||
}
|
||||
|
||||
|
||||
status_t
|
||||
ReaderLocker::_CheckBackgroundRead() const
|
||||
{
|
||||
@ -1028,11 +1034,8 @@ tty_close_cookie(struct tty_cookie *cookie)
|
||||
|
||||
ttyLocker.Unlock();
|
||||
|
||||
// wait for our turn (we reuse the blocking semaphore, so Wait()
|
||||
// can't fail due to not being able to get a semaphore)
|
||||
Semaphore sem(cookie->blocking_semaphore);
|
||||
cookie->blocking_semaphore = -1;
|
||||
requestOwner.Wait(false, &sem);
|
||||
// wait for our turn
|
||||
requestOwner.Wait(false);
|
||||
|
||||
// re-lock
|
||||
ttyLocker.SetTo(cookie->tty->lock, false);
|
||||
@ -1402,11 +1405,17 @@ tty_input_read(tty_cookie *cookie, void *buffer, size_t *_length)
|
||||
return status;
|
||||
}
|
||||
|
||||
size_t toRead = locker.AvailableBytes();
|
||||
if (toRead == 0)
|
||||
continue;
|
||||
if (toRead > length)
|
||||
toRead = length;
|
||||
|
||||
bool _hitEOF = false;
|
||||
bool* hitEOF = (tty->pending_eof > 0 ? &_hitEOF : NULL);
|
||||
|
||||
bytesRead = line_buffer_user_read(tty->input_buffer, (char *)buffer,
|
||||
length, tty->settings->termios.c_cc[VEOF], hitEOF);
|
||||
toRead, tty->settings->termios.c_cc[VEOF], hitEOF);
|
||||
if (bytesRead < B_OK) {
|
||||
*_length = 0;
|
||||
return bytesRead;
|
||||
|
||||
@ -5,15 +5,16 @@
|
||||
#ifndef TTY_PRIVATE_H
|
||||
#define TTY_PRIVATE_H
|
||||
|
||||
|
||||
#include <KernelExport.h>
|
||||
#include <Drivers.h>
|
||||
#include <lock.h>
|
||||
#include <fs/select_sync_pool.h>
|
||||
#include <util/DoublyLinkedList.h>
|
||||
|
||||
#include <termios.h>
|
||||
|
||||
#include <Drivers.h>
|
||||
#include <KernelExport.h>
|
||||
|
||||
#include <condition_variable.h>
|
||||
#include <fs/select_sync_pool.h>
|
||||
#include <lock.h>
|
||||
#include <util/DoublyLinkedList.h>
|
||||
|
||||
#include "line_buffer.h"
|
||||
|
||||
|
||||
@ -29,7 +30,6 @@ typedef status_t (*tty_service_func)(struct tty *tty, uint32 op);
|
||||
|
||||
class RequestOwner;
|
||||
class Semaphore;
|
||||
class SemaphorePool;
|
||||
struct tty;
|
||||
struct tty_cookie;
|
||||
|
||||
@ -87,7 +87,7 @@ class RequestOwner {
|
||||
void SetBytesNeeded(size_t bytesNeeded);
|
||||
size_t BytesNeeded() const { return fBytesNeeded; }
|
||||
|
||||
status_t Wait(bool interruptable, Semaphore *sem = NULL);
|
||||
status_t Wait(bool interruptable);
|
||||
|
||||
bool IsFirstInQueues();
|
||||
|
||||
@ -97,7 +97,7 @@ class RequestOwner {
|
||||
status_t Error() const { return fError; }
|
||||
|
||||
private:
|
||||
Semaphore *fSemaphore;
|
||||
ConditionVariable<>* fConditionVariable;
|
||||
tty_cookie* fCookie;
|
||||
status_t fError;
|
||||
RequestQueue* fRequestQueues[2];
|
||||
@ -151,7 +151,6 @@ extern device_hooks gSlaveTTYHooks;
|
||||
extern struct mutex gGlobalTTYLock;
|
||||
extern struct mutex gTTYCookieLock;
|
||||
extern struct recursive_lock gTTYRequestLock;
|
||||
extern SemaphorePool *gSemaphorePool;
|
||||
|
||||
|
||||
// functions available for master/slave TTYs
|
||||
|
||||
Loading…
Reference in New Issue
Block a user