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Fixed SYS_ARCH_PROTECT macros when NO_SYS is not defined.

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Added documentation for lightweight protection.

Fixed debug statement in ip.c.

Removed tabs in files I changed.
This commit is contained in:
davidhaas 2003-02-18 21:14:16 +00:00
parent 7f1becc682
commit e13c78820f
3 changed files with 89 additions and 40 deletions
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23
doc/sys_arch.txt
View File

@ -121,3 +121,26 @@ to be implemented as well:
"thread()". The "arg" argument will be passed as an argument to the
thread() function. The id of the new thread is returned.
- sys_prot_t sys_arch_protect(void)
This optional function does a "fast" critical region protection and returns
the previous protection level. This function is only called during very short
critical regions. An embedded system which supports ISR-based drivers might
want to implement this function by disabling interrupts. Task-based systems
might want to implement this by using a mutex or disabling tasking. This
function should support recursive calls from the same task or interrupt. In
other words, sys_arch_protect() could be called while already protected. In
that case the return value indicates that it is already protected.
sys_arch_protect() is only required if your port is supporting an operating
system.
- void sys_arch_unprotect(sys_prot_t pval)
This optional function does a "fast" set of critical region protection to the
value specified by pval. See the documentation for sys_arch_protect() for
more information. This function is only required if your port is supporting
an operating system.

2
src/core/ipv4/ip.c
View File

@ -349,7 +349,7 @@ ip_input(struct pbuf *p, struct netif *inp) {
#if IP_REASSEMBLY
if((IPH_OFFSET(iphdr) & htons(IP_OFFMASK | IP_MF)) != 0) {
DEBUGF(IP_DEBUG, ("IP packet is a fragment (id=0x%04x tot_len=%u len=%u MF=%u offset=%u), calling ip_reass()\n", ntohs(IPH_ID(iphdr)), p->tot_len, ntohs(IPH_LEN(iphdr)), !!(IPH_OFFSET(iphdr) & htons(IP_MF)), (ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK))*8);
DEBUGF(IP_DEBUG, ("IP packet is a fragment (id=0x%04x tot_len=%u len=%u MF=%u offset=%u), calling ip_reass()\n", ntohs(IPH_ID(iphdr)), p->tot_len, ntohs(IPH_LEN(iphdr)), !!(IPH_OFFSET(iphdr) & htons(IP_MF)), (ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK)*8));
p = ip_reass(p);
if(p == NULL) {
return ERR_OK;

38
src/include/lwip/sys.h
View File

@ -36,9 +36,6 @@
#include "lwip/opt.h"
#define SYS_ARCH_DECL_PROTECT(lev)
#define SYS_ARCH_PROTECT(lev)
#define SYS_ARCH_UNPROTECT(lev)
#if NO_SYS
@ -61,6 +58,11 @@ struct sys_timeout {u8_t dummy;};
#define sys_thread_new(t,a)
/* We don't need protection if there is no OS */
#define SYS_ARCH_DECL_PROTECT(lev)
#define SYS_ARCH_PROTECT(lev)
#define SYS_ARCH_UNPROTECT(lev)
#else /* NO_SYS */
#include "arch/sys_arch.h"
@ -115,13 +117,37 @@ void sys_mbox_fetch(sys_mbox_t mbox, void **msg);
mechanism than using semaphores. Otherwise semaphores can be used for
implementation */
#ifndef SYS_ARCH_PROTECT
/** SYS_LIGHTWEIGHT_PROT
* define SYS_LIGHTWEIGHT_PROT in lwipopts.h if you want inter-task protection
* for certain critical regions during buffer allocation, deallocation and memory
* allocation and deallocation.
*/
#ifdef SYS_LIGHTWEIGHT_PROT
#undef SYS_ARCH_DECL_PROTECT
/** SYS_ARCH_DECL_PROTECT
* declare a protection variable. This macro will default to defining a variable of
* type sys_prot_t. If a particular port needs a different implementation, then
* this macro may be defined in sys_arch.h.
*/
#define SYS_ARCH_DECL_PROTECT(lev) sys_prot_t lev
#undef SYS_ARCH_PROTECT
/** SYS_ARCH_PROTECT
* Perform a "fast" protect. This could be implemented by
* disabling interrupts for an embedded system or by using a semaphore or
* mutex. The implementation should allow calling SYS_ARCH_PROTECT when
* already protected. The old protection level is returned in the variable
* "lev". This macro will default to calling the sys_arch_protect() function
* which should be implemented in sys_arch.c. If a particular port needs a
* different implementation, then this macro may be defined in sys_arch.h
*/
#define SYS_ARCH_PROTECT(lev) lev = sys_arch_protect()
#undef SYS_ARCH_UNPROTECT
/** SYS_ARCH_UNPROTECT
* Perform a "fast" set of the protection level to "lev". This could be
* implemented by setting the interrupt level to "lev" within the MACRO or by
* using a semaphore or mutex. This macro will default to calling the
* sys_arch_unprotect() function which should be implemented in
* sys_arch.c. If a particular port needs a different implementation, then
* this macro may be defined in sys_arch.h
*/
#define SYS_ARCH_UNPROTECT(lev) sys_arch_unprotect(lev)
sys_prot_t sys_arch_protect(void);
void sys_arch_unprotect(sys_prot_t pval);