1 /* Blue Sky: File Systems in the Cloud
3 * Copyright (C) 2009 The Regents of the University of California
4 * Written by Michael Vrable <mvrable@cs.ucsd.edu>
14 #include "bluesky-private.h"
16 /* Miscellaneous useful functions that don't really fit anywhere else. */
18 bluesky_time_hires bluesky_now_hires()
22 if (clock_gettime(CLOCK_REALTIME, &time) != 0) {
23 perror("clock_gettime");
27 return (int64_t)(time.tv_sec) * 1000000000 + time.tv_nsec;
30 /* Convert a UTF-8 string to lowercase. This can be used to implement
31 * case-insensitive lookups and comparisons, by normalizing all values to
32 * lowercase first. Returns a newly-allocated string as a result. */
33 gchar *bluesky_lowercase(const gchar *s)
35 /* TODO: Unicode handling; for now just do ASCII. */
36 return g_ascii_strdown(s, -1);
39 /**** Reference-counted strings. ****/
41 /* Create and return a new reference-counted string. The reference count is
42 * initially one. The newly-returned string takes ownership of the memory
43 * pointed at by data, and will call g_free on it when the reference count
45 BlueSkyRCStr *bluesky_string_new(gpointer data, gsize len)
47 BlueSkyRCStr *string = g_new(BlueSkyRCStr, 1);
50 g_atomic_int_set(&string->refcount, 1);
54 /* Create a new BlueSkyRCStr from a GString. The GString is destroyed. */
55 BlueSkyRCStr *bluesky_string_new_from_gstring(GString *s)
58 return bluesky_string_new(g_string_free(s, FALSE), len);
61 void bluesky_string_ref(BlueSkyRCStr *string)
66 g_atomic_int_inc(&string->refcount);
69 void bluesky_string_unref(BlueSkyRCStr *string)
74 if (g_atomic_int_dec_and_test(&string->refcount)) {
80 /* Duplicate and return a new reference-counted string, containing a copy of
81 * the original data, with a reference count of 1. As an optimization, if the
82 * passed-in string already has a reference count of 1, the original is
83 * returned. Can be used to make a mutable copy of a shared string. For this
84 * to truly be safe, it is probably needed that there be some type of lock
85 * protecting access to the string. */
86 BlueSkyRCStr *bluesky_string_dup(BlueSkyRCStr *string)
91 if (g_atomic_int_dec_and_test(&string->refcount)) {
92 /* There are no other shared copies, so return this one. */
93 g_atomic_int_inc(&string->refcount);
96 return bluesky_string_new(g_memdup(string->data, string->len),
101 /* Resize the data block used by a BlueSkyRCStr. The data pointer might change
102 * after making this call, so it should not be cached across calls to this
103 * function. To avoid confusing any other users, the caller probably ought to
104 * hold the only reference to the string (by calling bluesky_string_dup first
106 void bluesky_string_resize(BlueSkyRCStr *string, gsize len)
108 if (string->len == len)
111 string->data = g_realloc(string->data, len);