Tiago Medicci Serrano 50aeea2dc0 mm/iob: Simplify IOB alloc/free logic ... - `g_iob_sem.semcount` must be equal to the total number of free IOBs. It can also be negative if there are no free IOBs and there are threads waiting for an IOB. - g_throttle_sem.semcount represents the number of IOBs available for throttled IOB allocations. Like any other semaphore, it should only go negative if there is a thread waiting for it. - Both semaphores are related to the same resource (free IOBs), hence, they must be incremented/decremented simultaneously: - Whenever a IOB buffer is freed, if a thread is waiting for a non-throttled IOB or a thread is waiting for a throttled IOB and we have at least `CONFIG_IOB_THROTTLE` buffers available, the IOB is put in the committed list (`g_iob_committed`). Otherwise, it is put in the common free list (`g_iob_freelist`). - `g_iob_sem` is always incremented when an IOB buffer is freed, but `g_throttle_sem` is incremented only if we have at least CONFIG_IOB_THROTTLE buffers free. - Both semaphores are posted with the schedule locked to avoid any mismatches in the semaphores count. - If a task is waiting for an IOB semaphore (`iob_allocwait`) is awakened and would check the `g_iob_committed`. The highest priority task waiting for a semaphore will be awakened first.		2024-06-25 15:21:00 +08:00
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CMakeLists.txt	net/can: Add SO_RCVBUF option for can socket	2024-06-14 19:54:07 +08:00
iob.h	mm/iob: Support alloc IOB via malloc	2024-04-26 01:06:21 +08:00
iob_add_queue.c	mm/iob: Replace the critical section with spin lock	2023-10-30 11:18:34 +02:00
iob_alloc.c	mm/iob: Simplify IOB alloc/free logic	2024-06-25 15:21:00 +08:00
iob_alloc_qentry.c	mm/iob: Replace the critical section with spin lock	2023-10-30 11:18:34 +02:00
iob_clone.c	mm/iob: replace CONFIG_IOB_BUFSIZE to IOB_BUFSIZE(iob)	2024-04-26 01:06:21 +08:00
iob_concat.c
iob_contig.c	mm/iob: replace CONFIG_IOB_BUFSIZE to IOB_BUFSIZE(iob)	2024-04-26 01:06:21 +08:00
iob_copyin.c	mm/iob: replace CONFIG_IOB_BUFSIZE to IOB_BUFSIZE(iob)	2024-04-26 01:06:21 +08:00
iob_copyout.c	nuttx: Use MIN/MAX definitions from "sys/param.h"	2023-02-01 23:47:44 +08:00
iob_count.c	mm/iob: add a helper function to get iob count in chain	2022-12-21 01:40:24 +08:00
iob_dump.c	nuttx: Use MIN/MAX definitions from "sys/param.h"	2023-02-01 23:47:44 +08:00
iob_free.c	mm/iob: Simplify IOB alloc/free logic	2024-06-25 15:21:00 +08:00
iob_free_chain.c
iob_free_qentry.c	mm/iob: Replace the critical section with spin lock	2023-10-30 11:18:34 +02:00
iob_free_queue.c
iob_free_queue_qentry.c	mm/iob: Replace the critical section with spin lock	2023-10-30 11:18:34 +02:00
iob_get_queue_info.c	net/can: Add SO_RCVBUF option for can socket	2024-06-14 19:54:07 +08:00
iob_initialize.c	mm/iob: Support alloc IOB via malloc	2024-04-26 01:06:21 +08:00
iob_navail.c
iob_notifier.c
iob_pack.c	mm/iob: replace CONFIG_IOB_BUFSIZE to IOB_BUFSIZE(iob)	2024-04-26 01:06:21 +08:00
iob_peek_queue.c
iob_remove_queue.c	mm/iob: Replace the critical section with spin lock	2023-10-30 11:18:34 +02:00
iob_reserve.c	mm/iob: replace CONFIG_IOB_BUFSIZE to IOB_BUFSIZE(iob)	2024-04-26 01:06:21 +08:00
iob_statistics.c
iob_tailroom.c	mm/iob: replace CONFIG_IOB_BUFSIZE to IOB_BUFSIZE(iob)	2024-04-26 01:06:21 +08:00
iob_test.c	mm/iob: Fix IOB length in iob_reserve	2023-08-22 09:09:21 +08:00
iob_trimhead.c
iob_trimhead_queue.c
iob_trimtail.c
iob_update_pktlen.c	mm/iob: Support alloc IOB via malloc	2024-04-26 01:06:21 +08:00
Kconfig	mm/iob: Support alloc IOB via malloc	2024-04-26 01:06:21 +08:00
Make.defs	net/can: Add SO_RCVBUF option for can socket	2024-06-14 19:54:07 +08:00