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Mutex protect L1Encoder::getNextWriteTime. It is called from another thread in GSMCCCH to set the channel start time.

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pat
2014-10-14 07:40:58 -07:00
committed by Michael Iedema
parent d1bb8df38c
commit b0737ba490
2 changed files with 19 additions and 4 deletions
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13
GSM/GSML1FEC.cpp
View File

@@ -243,6 +243,7 @@ void L1Encoder::rollForward()
// This implements GSM 05.02 Clause 7 for the transmit side.
mPrevWriteTime = mNextWriteTime;
mTotalFrames++;
ScopedLock lock(mWriteTimeLock,__FILE__,__LINE__); // (pat) Protects getNextWriteTime.
mNextWriteTime.rollForward(mMapping.frameMapping(mTotalFrames),mMapping.repeatLength());
}
@@ -316,7 +317,6 @@ const L1Decoder* L1Encoder::sibling() const
return mParent->decoder();
}
void L1Encoder::resync(bool force)
{
// If the encoder's clock is far from the current BTS clock,
@@ -328,11 +328,20 @@ void L1Encoder::resync(bool force)
mNextWriteTime = now;
mNextWriteTime.TN(mTN);
mTotalFrames = 0; // (pat 4-2014) Make sure we start at beginning of mapping.
{ ScopedLock lock(mWriteTimeLock,__FILE__,__LINE__); // (pat) Protects getNextWriteTime.
mNextWriteTime.rollForward(mMapping.frameMapping(mTotalFrames),mMapping.repeatLength());
}
OBJLOG(DEBUG) <<"L1Encoder RESYNC "<< " next=" << mNextWriteTime << " now=" << now;
}
}
Time L1Encoder::getNextWriteTime()
{
resync();
ScopedLock lock(mWriteTimeLock,__FILE__,__LINE__);
return mNextWriteTime;
}
void L1Encoder::waitToSend() const
{
@@ -2279,7 +2288,9 @@ void TCHFACCHL1Encoder::dispatch()
// Most channels do not need this, becuase they are entirely data-driven
// from above. TCH/FACCH, however, must feed the interleaver on time.
if (!encActive()) {
{ ScopedLock lock(mWriteTimeLock,__FILE__,__LINE__); // (pat) Protects getNextWriteTime.
mNextWriteTime += 26;
}
gBTS.clock().wait(mNextWriteTime);
return;
}

6
GSM/GSML1FEC.h
View File

@@ -110,6 +110,7 @@ class L1Encoder {
//@}
/**@name Multithread access control and data shared across threads. */
// (pat) It is not being used effectively.
//@{
mutable Mutex mEncLock;
//@}
@@ -127,6 +128,9 @@ class L1Encoder {
GSM::Time mPrevWriteTime; ///< timestamp of previous generated burst
GSM::Time mNextWriteTime; ///< timestamp of next generated burst
// (pat 10-2014) Another thread calls getNextWriteTime so we must protect places that write to mNextWriteTime.
mutable Mutex mWriteTimeLock;
volatile bool mRunning; ///< true while the service loop is running
Bool_z mEncActive; ///< true between open() and close()
Bool_z mEncEverActive; // true if the encoder has ever been active.
@@ -210,7 +214,7 @@ class L1Encoder {
const L1FEC* parent() const { return mParent; }
L1FEC* parent() { return mParent; }
GSM::Time getNextWriteTime() { resync(); return mNextWriteTime; }
GSM::Time getNextWriteTime();
protected: