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<h1>alloc.h</h1><a href="alloc_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/* -*- linux-c -*- */</span><span class="comment"></span>
00002 <span class="comment">/** @file alloc.h</span>
00003 <span class="comment"> * @brief Memory allocation functions.</span>
00004 <span class="comment"> * @todo Should really be alloc.c for consistency.</span>
00005 <span class="comment"> */</span>
00006
00007 <span class="keyword">enum</span> errorcode { ERR_NONE=0, ERR_NO_MEM };
00008 <span class="keyword">enum</span> errorcode _stp_error = ERR_NONE;
00009 <span class="comment"></span>
00010 <span class="comment">/** Allocates memory within a probe.</span>
00011 <span class="comment"> * This is used for small allocations from within a running</span>
00012 <span class="comment"> * probe where the process cannot sleep. </span>
00013 <span class="comment"> * @param len Number of bytes to allocate.</span>
00014 <span class="comment"> * @return a valid pointer on success or NULL on failure.</span>
00015 <span class="comment"> * @bug Currently uses kmalloc (GFP_ATOMIC).</span>
00016 <span class="comment"> */</span>
00017
<a name="l00018"></a><a class="code" href="alloc_8h.html#a3">00018</a> <span class="keywordtype">void</span> *<a class="code" href="alloc_8h.html#a3">_stp_alloc</a>(size_t len)
00019 {
00020 <span class="keywordtype">void</span> *ptr = kmalloc(len, GFP_ATOMIC);
00021 <span class="keywordflow">if</span> (unlikely(ptr == NULL))
00022 _stp_error = ERR_NO_MEM;
00023 <span class="keywordflow">return</span> ptr;
00024 }
00025 <span class="comment"></span>
00026 <span class="comment">/** Allocates and clears memory within a probe.</span>
00027 <span class="comment"> * This is used for small allocations from within a running</span>
00028 <span class="comment"> * probe where the process cannot sleep. </span>
00029 <span class="comment"> * @param len Number of bytes to allocate.</span>
00030 <span class="comment"> * @return a valid pointer on success or NULL on failure.</span>
00031 <span class="comment"> * @bug Currently uses kmalloc (GFP_ATOMIC).</span>
00032 <span class="comment"> */</span>
00033
<a name="l00034"></a><a class="code" href="alloc_8h.html#a4">00034</a> <span class="keywordtype">void</span> *<a class="code" href="alloc_8h.html#a4">_stp_calloc</a>(size_t len)
00035 {
00036 <span class="keywordtype">void</span> *ptr = <a class="code" href="alloc_8h.html#a3">_stp_alloc</a>(len);
00037 <span class="keywordflow">if</span> (likely(ptr))
00038 memset(ptr, 0, len);
00039 <span class="keywordflow">return</span> ptr;
00040 }
00041 <span class="comment"></span>
00042 <span class="comment">/** Allocates and clears memory outside a probe.</span>
00043 <span class="comment"> * This is typically used in the module initialization to</span>
00044 <span class="comment"> * allocate new maps, lists, etc.</span>
00045 <span class="comment"> * @param len Number of bytes to allocate.</span>
00046 <span class="comment"> * @return a valid pointer on success or NULL on failure.</span>
00047 <span class="comment"> */</span>
00048
<a name="l00049"></a><a class="code" href="alloc_8h.html#a5">00049</a> <span class="keywordtype">void</span> *<a class="code" href="alloc_8h.html#a5">_stp_valloc</a>(size_t len)
00050 {
00051 <span class="keywordtype">void</span> *ptr = vmalloc(len);
00052 <span class="keywordflow">if</span> (likely(ptr))
00053 memset(ptr, 0, len);
00054 <span class="keywordflow">else</span>
00055 _stp_error = ERR_NO_MEM;
00056 <span class="keywordflow">return</span> ptr;
00057 }
00058 <span class="comment"></span>
00059 <span class="comment">/** Frees memory allocated by _stp_alloc or _stp_calloc.</span>
00060 <span class="comment"> * @param ptr pointer to memory to free</span>
00061 <span class="comment"> */</span>
00062
<a name="l00063"></a><a class="code" href="alloc_8h.html#a6">00063</a> <span class="keywordtype">void</span> <a class="code" href="alloc_8h.html#a6">_stp_free</a>(<span class="keywordtype">void</span> *ptr)
00064 {
00065 <span class="keywordflow">if</span> (likely(ptr))
00066 kfree(ptr);
00067 }
00068 <span class="comment"></span>
00069 <span class="comment">/** Frees memory allocated by _stp_valloc.</span>
00070 <span class="comment"> * @param ptr pointer to memory to free</span>
00071 <span class="comment"> */</span>
00072
<a name="l00073"></a><a class="code" href="alloc_8h.html#a7">00073</a> <span class="keywordtype">void</span> <a class="code" href="alloc_8h.html#a7">_stp_vfree</a>(<span class="keywordtype">void</span> *ptr)
00074 {
00075 <span class="keywordflow">if</span> (likely(ptr))
00076 vfree(ptr);
00077 }
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