Last change
on this file since 577 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.4 KB
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Line | |
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1 | #ifndef MALLOC_PROVIDED |
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2 | /* |
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3 | FUNCTION |
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4 | <<__malloc_lock>>, <<__malloc_unlock>>---lock malloc pool |
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5 | |
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6 | INDEX |
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7 | __malloc_lock |
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8 | INDEX |
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9 | __malloc_unlock |
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10 | |
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11 | SYNOPSIS |
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12 | #include <malloc.h> |
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13 | void __malloc_lock (struct _reent *<[reent]>); |
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14 | void __malloc_unlock (struct _reent *<[reent]>); |
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15 | |
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16 | DESCRIPTION |
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17 | The <<malloc>> family of routines call these functions when they need to lock |
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18 | the memory pool. The version of these routines supplied in the library use |
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19 | the lock API defined in sys/lock.h. If multiple threads of execution can |
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20 | call <<malloc>>, or if <<malloc>> can be called reentrantly, then you need to |
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21 | define your own versions of these functions in order to safely lock the |
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22 | memory pool during a call. If you do not, the memory pool may become |
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23 | corrupted. |
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24 | |
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25 | A call to <<malloc>> may call <<__malloc_lock>> recursively; that is, |
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26 | the sequence of calls may go <<__malloc_lock>>, <<__malloc_lock>>, |
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27 | <<__malloc_unlock>>, <<__malloc_unlock>>. Any implementation of these |
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28 | routines must be careful to avoid causing a thread to wait for a lock |
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29 | that it already holds. |
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30 | */ |
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31 | |
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32 | #include <malloc.h> |
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33 | #include <sys/lock.h> |
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34 | |
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35 | #ifndef __SINGLE_THREAD__ |
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36 | __LOCK_INIT_RECURSIVE(static, __malloc_recursive_mutex); |
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37 | #endif |
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38 | |
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39 | void |
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40 | __malloc_lock (ptr) |
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41 | struct _reent *ptr; |
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42 | { |
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43 | #ifndef __SINGLE_THREAD__ |
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44 | __lock_acquire_recursive (__malloc_recursive_mutex); |
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45 | #endif |
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46 | } |
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47 | |
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48 | void |
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49 | __malloc_unlock (ptr) |
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50 | struct _reent *ptr; |
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51 | { |
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52 | #ifndef __SINGLE_THREAD__ |
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53 | __lock_release_recursive (__malloc_recursive_mutex); |
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54 | #endif |
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55 | } |
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56 | |
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57 | #endif |
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