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trace: method for getting buffer-wrap count

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This commit is contained in:
Josef Söntgen 2013-09-19 16:40:32 +02:00 committed by Norman Feske
parent 20883c52b5
commit 8b69d91c05
1 changed files with 13 additions and 2 deletions
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15
base/include/base/trace/buffer.h
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@ -30,6 +30,7 @@ class Genode::Trace::Buffer
unsigned volatile _head_offset; /* in bytes, relative to 'entries' */
unsigned volatile _size; /* in bytes */
unsigned volatile _wrapped; /* count of buffer wraps */
struct _Entry
{
@ -41,6 +42,12 @@ class Genode::Trace::Buffer
_Entry *_head_entry() { return (_Entry *)((addr_t)_entries + _head_offset); }
void _buffer_wrapped()
{
_head_offset = 0;
_wrapped++;
}
/*
* The 'entries' member marks the beginning of the trace buffer
* entries. No other member variables must follow.
@ -60,6 +67,8 @@ class Genode::Trace::Buffer
size_t const header_size = (addr_t)&_entries - (addr_t)this;
_size = size - header_size;
_wrapped = 0;
}
char *reserve(size_t len)
@ -71,7 +80,7 @@ class Genode::Trace::Buffer
if (_head_offset + sizeof(_Entry) <= _size)
_head_entry()->len = 0;
_head_offset = 0;
_buffer_wrapped();
return _head_entry()->data;
}
@ -87,9 +96,11 @@ class Genode::Trace::Buffer
/* advance head offset, wrap when reaching buffer boundary */
_head_offset += sizeof(_Entry) + len;
if (_head_offset == _size)
_head_offset = 0;
_buffer_wrapped();
}
unsigned wrapped() const { return _wrapped; }
/********************************************
** Functions called from the TRACE client **