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brk/malloc: Allow malloc to fail when out of RAM

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Fixes #76.
This commit is contained in:
Angus Gratton 2016-02-16 22:00:29 +11:00
parent d5221e7efa
commit f0db26604f
3 changed files with 22 additions and 14 deletions
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13
FreeRTOS/Source/portable/esp8266/port.c
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@ -82,13 +82,14 @@
unsigned cpu_sr;
char level1_int_disabled;
/* Supervisor stack pointer entry. This is the "high water mark" of how far the
supervisor stack grew down before task started.
/* Supervisor stack pointer entry. This is the "high water mark" of
how far the supervisor stack grew down before task started. Is zero
before the scheduler starts.
After tasks start, task stacks are all allocated from the heap and
FreeRTOS checks for stack overflow.
After the scheduler starts, task stacks are all allocated from the
heap and FreeRTOS checks for stack overflow.
*/
uint32_t xPortSupervisorStackPointer;
void *xPortSupervisorStackPointer;
/*
* Stack initialization
@ -219,7 +220,7 @@ size_t xPortGetFreeHeapSize( void )
struct mallinfo mi = mallinfo();
uint32_t brk_val = (uint32_t) sbrk(0);
uint32_t sp = xPortSupervisorStackPointer;
intptr_t sp = (intptr_t)xPortSupervisorStackPointer;
if(sp == 0) /* scheduler not started */
SP(sp);
return sp - brk_val + mi.fordblks;