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adts, lib: add some minor comments

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This was SVN commit r2121.
This commit is contained in:
janwas 2005-04-09 22:24:08 +00:00
parent a91f2d2079
commit 479f59e386
2 changed files with 21 additions and 4 deletions
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19
source/lib/adts.h
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@ -9,7 +9,11 @@
#include <map>
struct BIT_BUF
//
// FIFO bit queue
//
struct BitBuf
{
ulong buf;
ulong cur; // bit to be appended (toggled by add())
@ -42,6 +46,10 @@ struct BIT_BUF
};
//
// ring buffer - static array, accessible modulo n
//
template<class T, size_t n> struct RingBuf
{
size_t size_; // # of entries in buffer
@ -255,6 +263,15 @@ private:
};
//
// expansible hash table (linear probing)
//
// from VFS, not currently needed
#if 0

6
source/lib/lib.h
View File

@ -76,11 +76,10 @@ scope
#define STMT(STMT_code__) do { STMT_code__; } while(0)
// must not be used before main entered! (i.e. not from NLS constructors / functions)
// may be called at any time (in particular before main), but is not
// thread-safe. if that's important, use pthread_once() instead.
#define ONCE(ONCE_code__)\
STMT(\
/* static pthread_mutex_t ONCE_mutex__ = PTHREAD_MUTEX_INITIALIZER;\
if(pthread_mutex_trylock(&ONCE_mutex__) == 0)\*/\
static bool ONCE_done__ = false;\
if(!ONCE_done__)\
{\
@ -89,6 +88,7 @@ STMT(\
}\
)
// note: UINT_MAX is necessary when testing a Handle value and
// also returning Handle. the negative value (error return)
// is guaranteed to fit into an int, but we need to "mask"