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Merge pull request #571 from mapbox/atomic-decode

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Thread safety fix for decoding quadkeys to coordinates
This commit is contained in:
Eric Fischer 2018-05-23 01:39:39 +02:00 committed by GitHub
commit b65a5d1bb8
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1 changed files with 4 additions and 3 deletions
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7
projection.cpp
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@ -2,6 +2,7 @@
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <atomic>
#include "projection.hpp"
struct projection projections[] = {
@ -107,11 +108,11 @@ unsigned long long encode(unsigned int wx, unsigned int wy) {
return out;
}
static unsigned char decodex[256];
static unsigned char decodey[256];
static std::atomic<unsigned char> decodex[256];
static std::atomic<unsigned char> decodey[256];
void decode(unsigned long long index, unsigned *wx, unsigned *wy) {
static int initialized = 0;
static std::atomic<int> initialized(0);
if (!initialized) {
for (size_t ix = 0; ix < 256; ix++) {
size_t xx = 0, yy = 0;