I wrote:
> Early returns not good:

Also, these compiler messages are probably relevant:

ccache gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith 
-Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute 
-Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -g 
-fpic -I. -I. -I../../src/include -D_GNU_SOURCE -I/usr/include/libxml2  
-I/usr/include/et  -c -o test.o test.c
test.c: In function 'test_shm_mq':
test.c:89:3: warning: passing argument 2 of 'shm_mq_receive' from incompatible 
pointer type [enabled by default]
In file included from test_shm_mq.h:18:0,
                 from test.c:19:
../../src/include/storage/shm_mq.h:61:22: note: expected 'Size *' but argument 
is of type 'uint64 *'
test.c: In function 'test_shm_mq_pipelined':
test.c:198:4: warning: passing argument 2 of 'shm_mq_receive' from incompatible 
pointer type [enabled by default]
In file included from test_shm_mq.h:18:0,
                 from test.c:19:
../../src/include/storage/shm_mq.h:61:22: note: expected 'Size *' but argument 
is of type 'uint64 *'
ccache gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith 
-Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute 
-Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -g 
-fpic -I. -I. -I../../src/include -D_GNU_SOURCE -I/usr/include/libxml2  
-I/usr/include/et  -c -o setup.o setup.c
ccache gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith 
-Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute 
-Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -g 
-fpic -I. -I. -I../../src/include -D_GNU_SOURCE -I/usr/include/libxml2  
-I/usr/include/et  -c -o worker.o worker.c
worker.c: In function 'copy_messages':
worker.c:193:3: warning: passing argument 2 of 'shm_mq_receive' from 
incompatible pointer type [enabled by default]
In file included from worker.c:25:0:
../../src/include/storage/shm_mq.h:61:22: note: expected 'Size *' but argument 
is of type 'uint64 *'

I'm thinking maybe you just forgot to update the contrib module.

                        regards, tom lane


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