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trace_logger: be aware of trace-buffer wraps

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Issue #2735

Co-authored-by: Martin Stein <martin.stein@genode-labs.com>
This commit is contained in:
Johannes Schlatow 2018-04-10 16:12:01 +02:00 committed by Christian Helmuth
parent 9fc3344ee8
commit b47bf81b73
1 changed files with 15 additions and 2 deletions
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17
repos/os/src/app/trace_logger/trace_buffer.h
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@ -26,7 +26,8 @@ class Trace_buffer
private:
Genode::Trace::Buffer &_buffer;
Genode::Trace::Buffer::Entry _curr { _buffer.first() };
Genode::Trace::Buffer::Entry _curr { _buffer.first() };
unsigned _wrapped_count { 0 };
public:
@ -40,15 +41,27 @@ class Trace_buffer
{
using namespace Genode;
bool wrapped = _buffer.wrapped() != _wrapped_count;
if (wrapped)
_wrapped_count = _buffer.wrapped();
/* initialize _curr if _buffer was empty until now */
if (_curr.last())
_curr = _buffer.first();
/* iterate over all entries that were not processed yet */
Trace::Buffer::Entry e1 = _curr;
for (Trace::Buffer::Entry e2 = _curr; !e2.last();
for (Trace::Buffer::Entry e2 = _curr; wrapped || !e2.last();
e2 = _buffer.next(e2))
{
/* if buffer wrapped, we pass the last entry once and continue at first entry */
if (wrapped && e2.last()) {
wrapped = false;
e2 = _buffer.first();
if (e2.last())
break;
}
e1 = e2;
functor(e1);
}