Fix Windows build issues

This resolves #333.

include/jemalloc/internal/jemalloc_internal_decls.h

@@ -18,6 +18,7 @@
 #  endif
 #  include <pthread.h>
 #  include <errno.h>
+#  include <sys/time.h>
 #endif
 #include <sys/types.h>
 
@@ -61,6 +62,4 @@ isblank(int c)
 #endif
 #include <fcntl.h>
 
-#include <sys/time.h>
-
 #endif /* JEMALLOC_INTERNAL_H */

include/msvc_compat/strings.h

@@ -21,7 +21,37 @@ static __forceinline int ffs(int x)
 	return (ffsl(x));
 }
 
+#  ifdef  _M_X64
+#    pragma intrinsic(_BitScanForward64)
+#  endif
+
+static __forceinline int ffsll(unsigned __int64 x)
+{
+	unsigned long i;
+#ifdef  _M_X64
+	if (_BitScanForward64(&i, x))
+		return (i + 1);
+	return (0);
 #else
+// Fallback for 32-bit build where 64-bit version not available
+// assuming little endian
+	union {
+		unsigned __int64 ll;
+		unsigned   long l[2];
+	} s;
+
+	s.ll = x;
+
+	if (_BitScanForward(&i, s.l[0]))
+		return (i + 1);
+	else if(_BitScanForward(&i, s.l[1]))
+		return (i + 33);
+	return (0);
+#endif
+}
+
+#else
+#  define ffsll(x) __builtin_ffsll(x)
 #  define ffsl(x) __builtin_ffsl(x)
 #  define ffs(x) __builtin_ffs(x)
 #endif

test/include/test/jemalloc_test.h.in

@@ -11,7 +11,6 @@
 #ifdef _WIN32
 #  include "msvc_compat/strings.h"
 #endif
-#include <sys/time.h>
 
 #ifdef _WIN32
 #  include <windows.h>

test/include/test/timer.h

@@ -1,8 +1,5 @@
 /* Simple timer, for use in benchmark reporting. */
 
-#include <unistd.h>
-#include <sys/time.h>
-
 typedef struct {
 	nstime_t t0;
 	nstime_t t1;